I don't know anything about bikes... please help!
So after using my friend's road bike a few times, I decided that I'd like to get a road bike of my own for getting around campus. Unfortunately, I don't know anything about bikes.. so when i began to search for used ones on craigslist, I realized that they came in all kinds of different sizes and brands (I saw a lot of 'Shimano' references- is that a good brand?). I'm pretty small (5 feet or so)- what size road bike is appropriate for me? Also, I'm looking for something cheap- in the $100-120 range because I'm on a budget- what brand/type is most appropriate for that price range?... etc etc