Keep the drive chain clean and properly lubricated. Street use it won't get dirty very fast. Off road use, it will need attention after each session. Motorcycle shops sell the cleaner and the lube. Keep the tension on the chain correctly adjusted. New ones will stretch and become too loose. Sometimes the rear wheel can move forward, causing the same problem.
Tension should be checked after about each hour or two of use. Your owners manual should explain how much play there should be in the chain,
as it varies depending on length.