Nanny advice? πŸ˜©πŸ˜³πŸ€·πŸΌβ€β™€οΈ

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.