With no formal training or certifications I’d say go to a local tech school and learn how to weld. I know kids who starting making a bunch of money after only a year or two of vocational school welding.

If you don’t go that route, start off at fast food, local retail store, basically anything to start building a resume. Stick the jobs out for a while to build up some skills and eventually you can get better and better jobs. Some kids I went to high school with worked at Wendy’s and kept working there, working their way up the ladder so to speak. Now they each own their own franchise and are working on getting more.