I just built up a Peugeot
You'll need a French threaded BB (Velo-Orange sells one; I would link, but I'm lazy), and new cranks (you'll replace them sooner or later anyways, and if you look on Craigslist for long enough you should find something decent for <$50)
If you don't want to buy a new BB you can check out bike co-ops in your town that will help you rebuild your current one