Organizer is an interesting ability, but it's not going to help you colonize a lot of planets or build a powerful economy. With the Altarians, you can expect to come from behind when the fighting starts due to your allies, but your economy graph will be low compared to what you could do with another civilization. Try the Torians or Thalans or Iconians if you want a stronger start.
I think research is the most overpriced ability to pick. Research is only a fraction of your expenditures, while population and taxes are the majority of your income. Population growth is a much better pick than research if there are many planets to colonize, or if you're planning of fighting a lot.
Do this:
Set taxes so low, initially, that you maintain 100% approval. Your population will build twice as fast (even more if you have super breeder.)
Once you run out of your initial money, then you can jack up taxes on your inflated population.
The decision to buy colony ships, or buy/build factories and build colony ships depends on how many planets there are to colonize. If you're only going to be able to get a few planets, then buy the ships so you can beat your opponents to the planets. But if there are lots of planets to colonize, then it is more important to build lots of colony ships than it is to build a few quickly. Buy/build factories until you can build one colony ship ever two turns, and then pump them out at that rate continuously.
Don't set and forget your spending sliders, move them so you can get what you need ASAP. For example, do 100% research to get Ion Drive, then 100% social to build factories, then 100% military to build colony ships, then 1% military, 99% social to build colony ships while building up new planets, then 100% research to get basic planetary facilities, then 1% military and 99% social to build them and constructors, then 100% research to get basic military technologies, then 100% military to build a fleet, etc. Decide what your immediate needs are, then fill those needs as fast as possible.