Like Krazy said, this all can be very expensive, or if you are carefull, and learn quick, it might not be.
It is very addictive, vastly different than cars, gobs more fun.

As far as a trainer, choose a secondhand flatbottom wing trainer. might be able to pick one up for 200 or so ready to fly. Granted you still need ground equipment, but not much.

Most importantly, find someone who is already in the hobby, and local, have them help you.