You made me smile real big seeing that another teenager has jumped on board. I bought my mustang at 14 (26 now) and have been working on it ever since (no engine or trans came in mine....).
Best advice I can give since it sounds like you have a nearly complete car: get it running, address the rust, have fun!
Anything can be learned with patience. If you don't already, get a little wire welder, learn to use it, read some books, and get after it!
Welcome to the forum, there is a huge pool of knowledge here. Be sure and do some searching before you post, but if you are ever unclear, fire away with questions!
Does she run?