@Soul-Stream:

Annie is by far the most optimized bot, and she is consistently the most dangerous one to face one-on-one. I've also noticed that newer players almost never buy magic resist items, which means they aren't mitigating any of her damage. My advice would be to pick up at least one heavy MR item, and never bunch up when attacking her, as two of her spells are AoE. She's a lot less dangerous when helmed by an actual player, though, and tends to be easily shut-down by more experienced players.

Feel free to play around with masteries all you like. You can change them at any time.

Runes, as Krazikarl said, should be left alone for now. In all honesty, the lower-tier runes aren't very powerful, and the upper-tier ones can be expensive. If you come into level 20 with a nice IP balance, you'll spend a lot less time "grinding" and more time just enjoying the game, even if you end up playing the same amount of games. The other reason I would avoid getting them before level 20 is that, like me, you will inevitably purchase runes that you will end up rarely using. Wait until you have an idea of what runes will work best for your main characters, and which ones are more powerful or benefit more characters and builds than others.

I'll try and get some time to play this week, but I've got a paper due on Thursday and I'm not as far along as I should be.

Don`t watch videos just keep playing. But if you`re looking for some champion guides check http://leaguecraft.com/  . You can find there a lot of good ideas.

I think that there are no better champions, just better players. To master a champion you need to play at least over 100 games. So first thing you need to do, is to find champion you like most (playing style, voice, look . I found best champion for me after checking 3-5 champions, so don`t think you will have to check all champions to find this perfect one.

About IP, you get 150 for every first win of the day. I don`t know how it is now, but for games with bots you will gain less exp and IP.

And don`t worry, i feel still confused in some situations, after this 300 games

My favourite champion is little, cute, deadly, super assasin called Teemo 

You can change masteries anytime other than while playing a match at least. You can change them out of matches by going to your profile, and you can change them in the champion select screen immediately before a match begins. Just keep an eye on the countdown ticker, as you wont benefit from any points still unallocated when the match begins.

Bot game IP rates have been altered. The IP you gain now depends on your summoner level, so newer players receive full points, and older players receive less and less. The old bot games per day limit has also been removed and replaced with a timer limit. You get something like 2 hours a day of bot-games before they cut off any IP or EXP growth. They really want you playing against actual people.

As for favorite champions, I tend to go with fast, squishy, and high-damage characters. These tend to be ninjas ans assassins, but not casters (as they tend to be slow!). So that means characters like Yi, Akali, Ashe, Warwick, and Nocturne. Sometimes I'll also migrate over to heavier champions, as long as they are still fairly fast or have mobility options, such as Jax or Lee. I rarely ever play dedicated tanks, support, or casters, as I don't have the mindset for it.

I'd say go with Cho, if you like him. Sure he has a skillshot, but it's an AOE, and failing it isn't so damning as some other character's skillshots. You also won't improve without practice!

Avoid invisibility for now. Not because, as KraziKarl pointed out, Eve and Twitch are bad characters, but because all three require some exceptional skills to use properly. Any champ can be effective if you develop a knack, but it's a lot harder for those three.

In regards to my favorite champs, the easiest to play would have to be:

Ashe - Despite her Skillshot Ult, which takes some real practice, her other abilities are all noob friendly

Warwick - You can jungle with him at summoner level one, just not very well. Otherwise, his abilities are pretty noob friendly as well.

Jax - I'm on the fence. He's a very aggressive champ, which often leads to new players getting themselves killed, repeatedly, but he's going to be the safest one to give hybrid builds a try in, and his passive has some synergy with the noob's general tendency to only stack damage items.

As for the others, Yi is just too weak these days and too easy to shutdown. Akali is a great champ, but takes practice and downright deserves a full rune set. Nocturne... well, there are just a ton of new Nocturne players who are downright terrible. The game doesn't need another! Ditto goes for Lee, who also has the dedicated distinction of having a schizophrenics array of skills requiring a degree of timing.

Some champs are a lot more difficult to play than others once you play against people who know what they are doing.

Take Teemo.  He is very easily killed, a highly desirable target (high damage, easy to kill), has only moderate range, and has no built in escape mechanism.  Tristana, for example, fills a similar role but is easier to play.  She is just as squishy and is a simililarly desirable target, but she has greater range, a built in escape mechanism (Rocket Jump) and a push back that can be used defensively (her ult).  This means that Teemo basically will get killed every time he gets out of position in a teamfight (or have to burn a Flash, which is on a very long cooldown), while Tristana can often survive one or two bad positioning incidents in a team fight.

Thats the big difference - some champs get hammered every time you make a small mistake, while some champs give you a lot more leeway.  Teemo is probably better if you rarely make even small mistakes, but Tristana works better for most people.

And you dont want to be blowing your spells on other champs as soon as you can.  Their tank should be initiating for them, and you dont want to blow anything on him.  Your team should be calling out targets and you should be saving your cooldowns for valuable, easily killed targets like carries and support.  Using spells on the first available targets is one of the most frequent mistakes that new players make - you will want to learn to identify which champs do high damage but are not very survivable and save your spells for them.

Oh, I see then... So LoL actually is all about knowing the entire Hero Database

So you just have to play and play like crazy to know that and study every champion you see... All the sudden that makes think that it's way too much work to play LoL !

I really have too look at them !   Unfortunately, I have to get points to unlock them... First I would unlock is Cho Gath because I've seen him IG and I thought his skills were pretty cool !

On the other hand, when I saw the video for the first time, I thought that guy with the scroll on his back (whatever is name is) would be cooler with his skills ! Big Disapointment !

I'm just afraid of the community... Seems like the community ruins it all because they're hardcore gamer who cannot accept that someone start the game and learn how to play or probably doesn't want to play hardcore and be in the top 100 !