What type of insurance do I need for my business?

I run a small business out of a friends garage (no garage at my house) to detail cars. I usually do mobile detailing but in the winter it becomes too cold.

My goal is to offer a valet service to customers where I pick up their vehicle, bring it to the garage, and then drive it back. What type of insurance do I need to do this? Do I also need some sort of garage keeper insurance?