You are going to be on a very long learning curve like the rest of us and you will never find a conclusive answer.  As mentioned in the previous posts, read the tutorials in the sticky thread and prepare to wade through reams of how-to's and theories.  And you will come back with more questions.  The best thing to do, play with Poser as per each tutorial instruction and experiment.  This will give you some greater understanding on the how's and why's.  Create some images and post them for critiquing.  Other individuals will gladly pointout your good and bad points in your renders.  And, importantly, ask questions!  That is how you will learn.