Typical that right after i posted in this thread my harddrive died a death and spent days just diagnosing it and recovering everything XD
I think Blizzard's answer covers this mostly but if you're worried about finding fonts without having to worry about the legal issues,
google fonts are all fine to use for commercial products.
I originally tried getting some off the other usual font sites but the licencing documents for even a single font seemed to vary based on which site you got them from, so fearing stumbling into some kind of licencing issue, I just either use google fonts now or at some point I might try making my own
edit:
Scope is most people's biggest enemy. Aim small then once you feel you've got something simple, toss it and aim even smaller XD
use some of your initial time to get a general idea together and prototype it quickly and cheaply as you can. Having a clear goal before you get down to the serious work will help you not get lost before you get to the finish line :3
Then again i only really do 7 day jams so you might have a lot less time than I usually do ;D