Craps is fun, and has the highest odds of all the casino games played. If your going to the table with just $100, then your going to need to have a little luck if your going to play very long.
As far as how to appoach the game with that amount of money, I suggest play the minimum on the passline, with maximum odds behind it. Once you build a little of a stack, you can play the come (just like the passline) to place additional numbers. Just make sure that you bet the odds, otherwise your not maximizing your potential.
Good luck
-Shep!