PS3 game development is done in C/C++, not flash.
Grab some books, check the torrent's for evilsperm's PS3 SDK Unbuntu release. There is documentation in his release for developing software. It's a good place to start.
You will also need to be familiar with OpenGL (Sony has their own version) and I believe the SDL libs. If you plan on using text, familiarize yourself with the OpenType font libraries. That will allow you to put a score up, and do some animated graphics.
Oh, and your sig is creeping me out. If you insist on keeping that pic, I may be forced to use this in mine:
Working hard on UberCFW, incorporating NTFS, sub-free NetFlix and Blockbuster, PSN cheat system with built-in swearbot and MAC-spoofing, Adding MKV, RAM and BIK movie support, and Xbox360 emu*.
*not really. Get a life, newbs...
My YouTube channel: http://www.youtube.com/user/BenJeremy