It all really depends on how you learn best. For me, sitting down, and getting my hands dirty has worked the best. In light of that, what I would recommend is finding a simple everyday object, like a pen, or a cup, and start to model. I'm assuming that you've at least watched one or two of the basic modeling tutorials, so you understand the simpler aspects of how Blender UI works(Or doesnt work...). If not, then I would try and find some videos walking you through the very basic, beginning steps. Then as you are modeling your objects, and you arent sure of how to do something, poke around in the menus, try out different tools, post on the forums(Blender would probably be the best, though I'm sure PM specific people could help to). When looking around how to achieve an effect, you may not find what you are looking for, but I find that effects and tools that do unexpected, yet cool things stick in my mind better, and when the time comes for me to need them, I remember how I did them.
Then again, if you learn best by watching, I might google videos of people actually modelling various objects, so you can see their process, etc.
On a semi-related note, I would HIGHLY recommend checking out
http://www.wings3d.com/, It is the modeling program that I first learned on, after giving up on Blender 2-3 times, because in my opinion, the UI sucks. I will warn you now, it is not nearly as complete as Blender, but as far as I know, you are able to do everything you need to in order to create models for pep. There is a forum community, while not large, they are active enough that your problems will be sorted out in a day or two. If you choose this route, feel free to message me, and I would be happy to help you get started, and then answer any questions I can.
Good Luck!
-Apoc
