James,
WELCOME TO THE AWS WELDING FORUM!!
Starting pay is whatever the market will bear. Your geographic location, type of work, availability of other inspectors, employed or sub-contractor, and several other factors are going to be part of the equation.
Whatever you do, don't shortchange yourself and all the rest of us. Too many are taking jobs cheap just to get their foot in the door. Granted, we all needed a hand when starting and we have to make a living. Just beware of how you let them use that against you.
Good Luck.
Have a Great Day, Brent