New landlord help how to find or make a lease

[Faustin Hoover]

Hello i had a couple questions. If you buy a rental with tenants in place already do you have to wait until their current lease expires? If so how do you make a new lease or where can you find them and is there anything you should change right away? Lastly if there are some minor renovations that need done do you send them a letter to let them know and how long in advance should you let them know? Thanks!