Like angelz said relax first. don't go run off to tech school just because it's something to do. Figure out what you want to do. I hope you and the wife have talked and hopefully she is supportive. Think of what you would enjoy doing. Batting cages might be a bear to set up and run. I know nothing about this but you're talking a lot of overhead to get started.
I worked in maintenance for apartments when I left the steel mill. My wife supported me in doing so since it was a massive pay cut. I just couldn't do it anymore. Maintenance was fine basically some electrical and plumbing and painting. I noticed how many bad painters we went through. these guys come in as subcontractors for other painters and whip through an apartment in like 2 hours. 150 to 200 bucks an apartment depending on size. Really subbing as a painter is relatively cheap set up. cost for a paint sprayer, some tools respirator etc. then get your llc and some insurance. that's pretty much for anything you may want to start up. But it's got to be something you will WANT to do. Apartments, houses always need painting. I actually ended up doing bathtub repair. Really simple and almost no overhead. took a good year to get regular business but it's going well now.
if all else fails come visit here in Charleston South Carolina area. man this place is booming!!! we have a Volvo manufacturing site opening up soon, Boeing , Mercedes, scout boats, paper plant steel mill aluminum plants. and yeah welding is a huge skill to have. I learned while in the steel mill. never needed math for it but I could weld. its not pretty but it worked.
Sorry little longer winded than I wanted to be. bottom line life is short enjoy it and do something you want to. I love being my own boss. scared my wife to death but she likes it now.
Peace
siDARKde!!!!!!!