you'll have to start as a cat 5 and upgrade through the categories racing with a local team. once you start racing it will become very clear if you have what it takes or not. if you're doing well and producing consistent results as a cat 1 or 2 then it'll be time to start shopping for an offer.

heck, even if you don't make it as a pro, amature racing is a hell of a lot of fun without all the pressure.