Inherited home with tenants

[Yengkong Sayaovong]

My parents gave me a rental home. My name is on the home now so I can manage the property.

The tenants my parents found has been on a month to month contract for 4 years no ow after their 1 year contract ended.

They have set up a tent to fix cars and my parents have gotten a complaint about them working past midnight. It was nothing major.

If I was to do a new contract, is their anything I can legally do about them fixing cars? Am I allowed to have a key for the shed they built if lease states landlord must have keys for all locks on property?

Can I put on lease they can not fix cars after a certain time? They state it's not a business but they fix cars for different people all day long.