12? neat! i got started when i was about 12 or 13, but on tanks. later i moved onto a viper and after i "totalled" the paintjob i gave up on it for a while and i started back when i was about to turn 15. im 16 now and still am hooked
in other words, since you are just starting out dont let a huge mistake or a model car go completely wrong discourage you. since then ive probably ruined 3 or 4 other cars that i put 10-15+ hours each into due to my lack of experience. its always ok if you make a mistake, as long as you learn from it.
oh yeah, welcome aboard