When I want to learn something new, I like to find a book or a series of video tutorials that teach it. For Poser, the Poser Pro 11 tutorial by Renderosity looks like a good way to start: "Poser Pro 11 Tutorial: Introduction to the series"

Of course that's just covering the mechanics. There's a lot more to learn that's not Poser-specific: posing, composition, camera use, lighting, colors, etc.

-- I'm not mad at you, just Westphalian.