If you are planning to hire a full-time baby-sitter, then you should hire from a professional place so that their backgrounds are checks. Interview lots of them and trust your mother instinct. Set cameras around the house and keep monitoring.
If you are planning to put your child in a daycare, then you should check as many places as you can and compare the facilities and other criteria. Get recommendations from your family and friends since they are the ones already using the services.