just watch as many video tutorials as possible. Make sure you remember everything from each tutorial, practice-perfect.
hi, I would suggest you learning flash from (1) lynda . com , (2) senocular . com / flash / tutorials / as3withflashcs3 , (3) gotoandlearn . com Also, practicing with pre-made templates can be quit helpful. For example, try FlashMint . com XML Flash templates
"How to Cheat in Adobe Flash CS5 Professional" is the best book to learn flash from beginner to advance level.