Hey there, welcome to the addictio... err hobby!
Before buying alot of paints. Stop at a craft store and spend a dollar on a Color Wheel. It is a tool which shows a plethora of colors and whether prime or not and what colors go well with them.. whether doing a triad of 3 colors or looking for complimentary colors.. Cool colors versus hot colors.. You name it .. a color wheel will help you know what colors you want.
Next you can go with either a starter kit, or just the colors you will want for the paint scheme you want to produce. Games workshop has some great paints, but so do Reaper master series and Vallejo game color. Game color and reaper master series have eye dropper bottles which makes painting easier, without having to paint out of the bottle itself which is a really bad idea.. (even if I started out that way) Also, give some thought to the protecting your hard work on your figures. do you want them shiny, satin, or flat. Invest in either a can of clear coat, or in some really cheap throw away sponge brushes/brushes to apply a clear coat by hand.
Gloss protects best.
Flat looks best
a Satin clear coat is a good compromise between the two.
Reaper's website has a tool on it, that if you see a color you like on any image.. you simply pull it up and click on the color you like and the power pallette tool will identify what color paint you need to replicate it.
http://www.reapermini.com/PowerPalette
Hope some of this is helpful,
Ronin