While some leagues and competitions will have weight, battery, and/or other regulations, to get started there are no rules. The local racing leagues we've looked at do not have regulations for their basic race days, but if you want to be competitive, you're going to want more than just an entry level machine. Do not go overboard, we've watched skilled pilots with $250 drones win races over rookie pilots with $1,000 setups, just get a starter machine and start flying. Give yourself time to grow into your first victory.