Well, seeing as Poser originated as a tool for painters, I'd say you should just start with Poser. There's a lot of figures already included and they will last you a while. If you're really hooked then you can always buy more. But Poser in itself contains all you need for a start.

Good luck! and I love that painting. Surreal in the cool way! It's like pieces from a dream! ^_^

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.