You said your moving to Pa, a lot will depend on where in Pa, city, or out in nowhere land, Outside the city limits, it's wild wild west for any contract work, anyone with a running pick-up, is a contractor, and multi trade at that, they can paint your home, cut your lawn, and wire you house all from the same truck, if you go with a national like Mr E. you may do well with calls, but you may also put 400 miles a day on your truck and have to start at 5AM and get back at 10PM, to make a days work.
I think for a young gent, that is serious about making it in the service business, could benifit from a national connection, as for the questions to ask, i would want all the information they have to offer, and not sign any agrements, until i had a lawyer review all the contracts, and go over all the terms and conditions with me.
Good hunting.