http://myworldfromabicycle.blogspot....-will-win.html
I'm 15 too but I have read so much on cycling, i know how to properly use a power meter and analyze files. I live in Los Angeles too.
You dont need a road bike I used to train on a fixie and still do sometimes, its great for cadance but i do suggest getting a smaller gear ratio one that you can climb on even if you have to spin on the flats. DONT worry about miles worry about time, say 4 hours for an endurance ride instead of 60 miles. Just
ride lots and lots and lots.
If you wanna get serious start with these book Bike Racing for Juniors, then The Cyclist Training Bible, then if you wanna get more serious Training and racing with a power meter.