How to Memorize Tricks?

I'm having a problem. I often learn too many tricks and then forget how to do them, or I accidentally mix up sleights or forces from one trick with another. I'm not sure if that makes sense. I know the recommendation is to learn a minimum of 4 or 5 magic tricks to start, but I think that's too few, because you don't always want to show people the same trick; you want something new.