Nanny advice? 😩😳🤷🏼‍♀️

New Mama
After a less than comforting run w a licensed family daycare, we are considering hiring a nanny until my school year ends in June.  We've gotten a number of applicants on care.com and I'd love any advice from parents that have done this before!  Especially regarding the business end of it.  Should we design a contract?  Handle payment as an employee or contractor? Liability concerns?  We are only considering experienced providers.