Yes, Rebirth should be the first thing people learn, because the sound is very decent, and what you learn is universal (pattern programming, etc..)
You should force yourself

and learn Rebirth step by step with the demo in order to gain the basic knowledge. The good thing is that you can do everything from composing ot exporting from within the same program.
Good luck! It is not very very easy but the tutorial should help, plus you can post ANY question you have here.