If you have no money or litte money just get a new chain... get rust remover like naval jelly (ask to your friends to safe money) and clear the rust from the chainrings and crankset. Take the BB appart and regrease it. New cables just in case.... and please put a stem with the right angle in the bike (maybe somebody has one to spare in here?)

You where living here i would fix the bike for you (free obviously) but i see you are too far to do it. Anybody in the area to help this kid???