Ursin knows whats up. My advice is about the same but even more primitive. Now that you have all this knowledge, go find a drummer, find a room to jam in where you wont get the cops called on you, and then just start banging out some riffs and jam on it. STOP OVER ANALYZING shit dude - you have to sit there in the fucking room with a drummer and just bang it out. "What do I play???" FUCK YOU!
DONT ASK THAT QUESTION. JUST FUCKING DO IT.