I think you'd be a fool to move to SC. It's a dump. Every last part of it. Look at other places. You are the "bread winner". She can be a server anywhere. Literally. Your ability to generate income is of greater importance. Look at Denver. Higher cost of living, but you'll earn more wealth, her kid will get a better education, you'll have more options as far as job opportunities. Most importantly you don't have to make it happen today. It'll take time to fund the right opportunity no matter where you go.
People that jump in head first usually don't have a bucket to piss in nor a window to throw it out of.