Figure skaters please answer!!?

I am 15, and have recently discovered figure skating. I would love to learn how to do more moves and get better. One of my best friends is a figure skater and she has taught me some things, like 2 foot spins, and the waltz jump. I can also turn around and go backwards. I can do the forward "fishies" and the backwards "fishies". I can do forward stroking as far as I can tell, and forward crossovers too. Im working on backwards stroking and backwards crossovers. I can do a 3 turn, but they are not good, and need more practice. Am, I too old to start, with a coach? Should I start with a coach, or go to learn- to - skate adult level?