I want to make around 10 RC cars for racing. Is there any ready made radio control units that I can buy where I can assign each radio unit to each car and then race with those cars? If so can you tell me where I can get it (website link).

If I have to make it by myself can you tell me which RF modules I need to buy and use?

Thank you

P.S I am new to it and dont have much knowledge on radio control units