If you really want to use Flash just start out learning that. There are oodles of Flash tutorials on the web. You will need to be using Actionscript 3 if you want to publish your game on the iPad. Warning - Flash apps are sluggish on the iPad. If you are planning to do anything that requires speed (E.g. lots of smooth animation, physics, etc) then you are probably better off using something else like Corona or Unity.
mike
:8^]