Im fasinated by a good aerobatics routine.
Me too!
It's probably going to depend upon the style of flying you want to do. I consider myself a "classical" or "warbird" type pilot as opposed to a 3D type pilot. I try to emulate airshow style, warbird type maneuvers. Key to this approach IMO is the ability to operate in the vertical plane and to do vertical turn-arounds. This provides the setup and the foundation of the routine.
To get started, Imagine you are perpendicular to your runway. The runway extends straight on out on both ends to infinity. The runway itself extend 90 degrees straight up to infinty. A big rectangular canvas right in front of you. That is the plane in which you operate.
The turns are up to you. You can do stall turns, half cuban eights or reverse half cuban eights. Nothing wrong with stretching out a little and using a wingover. The point of it all is that you end up going straight down the flight line, straight down show center going both directions. Each time you pass show center you have the opportunity to show off a loop or a roll or whatever you want to do. Mix and match.