Cool, I also started recently to have a pet wolf spider. He has been shying away on the ceiling for a couple of weeks, some days ago I found him on my neck, probably he was on my hoody during the night.

They get more comfortable around people over time if you do not bother them and they protect you from disusting insects.

I do not think you need to feed him, let him do his own thing. If he came to your shop he most likely knows what he is doing and will find food for himself.