Both the software tutorial and SmithMicro.  There is a wealth of information out there, and, for the most part, enough to confuse the heck out of you.  Generally, start with the basics, create a few renders and analyse them.  See what are your strengths and weaknesses and come regularly to the forum to find solutions and answers.  And it can be any forum on any website.  Just feel comfortable posting your problems no matter how simple or complex they may be.  Poser has a very steep learning curve and you will only get out of it what you put in.  Enjoy the hobby and don't let it stress you out.  It is suppose to be fun.