I've been lifting weights for about 4 months now. Two straight months, and 2 months on and off (I find it hard to have the time to exercise with school work). I'm going to start to lift weights regularly again, and I was wondering if there is a good muscle building program out there for someone like myself. I was thinking about trying the Positions of Flexion work out, but I don't think I need something as intense as that.
Honestly, you're at an advantage. Because you're a beginner, there are very little odds of you doing something counter-productive.
What I would advise you not to do, however, is adopt some training program designed for elite athletes or bodybuilders. This is a very common mistake which could be avoided with a simple logic: If you're not an elite athlete or bodybuilder, don't follow a program designed for one.
What type of area do you live in (urban, suburban, rural)? Are there trees in the park? Then do the pull-ups/chin-ups from a tree branch. You can do dips between two sturdy chairs, between two counter tops (either between an island and another counter top, or where two counter tops come together to form a right angle), between where two railings meet (on a porch, fire escape, etc...). Really you just need to use your imagination.
Or alternatively you could invest in a set of gymnastics rings. They're not free, but they will allow you to do a large variety of exercises. Here is the type that I myself have. They are adjustable (to different heights), so they allow for easy changing of exercises.