You have to join a CAMS affiliated club, like Newcastle MG Car Club.
You have to get a CAMS competition licence – it costs under $100 for a full 12 months.
Then you have to have a crash helmet that meets standards, leather shoes and long sleeve cotton shirt and long cotton trousers. This is the minimum standard for “speed events”. You also need a fire extinguisher in a metal bracket that the driver can reach from his seat. And a safe car!
For motorkhanas you don’t need anything more than a safe car.