This somehow made me choose to buy it
Thanks.
Play a couple single player games, hit up the strategy section to better learn how to play your favorite dg, and then join noob lobbies once you can beat hard ai
If you can't remember which items you want or talents you want, www.demigoddb.com is a very nice resource to use outside of the game. Follow that advice for the best experience possible 
And early on, I would suggest learning oak, erebus, or unclean beast first!