Dreaming up stuff is fun, but it does not count for anything, if you only stop at that. Inaction is the surest way to fail. That's kind of obvious; I know, so why then do we still dream about success, and yet not start?
Luck has a big part to play in ideas succeeding, and you're only as lucky as the number of ideas you've tried. So it's not just the "doing stuff", but the "doing LOTS of stuff" that really matters when your looking for those few ideas that will eventually succeed.
Oh, and when your doing lots of stuff, expect a lot of them to fail.