There are a whole bunch of things you're likely to get wrong trying to design your own "hybrid" encryption system. It's not easy. Why not spend some time learning how to break crypto before you start building it?
I agree. There are whole classes of problems that are not at all obvious until one has spent time learning how to break bad crypto. Matasano's challenges[0] (which I think tptacek helped create) are a good start.
