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If you knew you had the knowledge or the time and brains to learn how to utilise Flash in such a way you'd start with your idea. Drawing up game-play, characters and plot. Map out what you want to do so you're not making it up as you go.
If you don't have the knowledge or the time and brains to learn, you'd start by giving up your dreams and try something simpler. 
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well the only thing i would have problems with would be the AS to code how multiple online players would interact. That might be a very useful thing to learn though...