I know the feeling, I've done the same thing myself on more than one occasion. It's like: "Wow, that's good idea, I think I'll make it!" Then, I'll start making it and find that I have no idea what I should be doing next. Planning helps. Period.
Anyway, enough of my ramblings, I might be able to contribute some ideas, but could you be a bit more specific about what you want to achieve with this game? I.E. Is it a story driven RPG (like Diablo), or one where you get to do what you like (like Ultima Online)?
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I'LL GET MAH STABBIN KNIFE!
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