Poser is a very fun and addicting program. But it can get very expensive. Not only do you have to buy one of the Poser programs, but you also have to buy the 3d models to use in it, unless you make your own. Here's a link for a free 30-day trial - http://poser.smithmicro.com/trial.html This is for Poser 9. I use the Pro version (Poser Pro 2012). If you decide you like it, but can't afford to spend the money on it, there is also a lite version, Poser Debut.
If you have any questions, let me know and I'll try to answer them to the best of my ability.