U have to do it old style, fix gear with super light gears (42x18 or 20 to start with), but to do it u need a training plan that will last at least month an a half to two months and be ready to ride at least a century with fix gear and low gears, it will crash you big time because u are not used to the constant pedaling. Once you are done with it u'll have learn the most hard thing in cycling, the constant pedaling and the high cadence. Anything else after that will be piece of cake. This is the 1st thing juniors have to learn, because is the base to anything else, program the pedaling and it will stick forever even if you are not cycling no more.

Good luck