Here's my experience, in the greater Seattle area. Keep in mind this is one of the most expensive places to live in America so salaries tend to be higher.
When I got out of the Marines I took a job as a delivery driver, $15+ per hour and only needed a straight Class B CDL with no endorsements. I may have gotten extra as I had a Class A with double/triples, passengers, and tankers.
I left that because I wanted to be a machinist. Got on with a small production shop north of Seattle, $14+ per hour for sweeping, emptying the trash, and general bitch work. The hiring foreman made it sound like an informal apprenticeship where I would have a chance to learn. In practice that was not the case. I left pretty quickly, lack of opportunity for advancement in a reasonable time frame. "Maybe in a few years someone will retire and then you can do more than carry stuff." No thanks. And it was a crap environment to work in, foreman stop watching you every time you took a piss etc. In talking to an experienced machinist, he was pulling down... Maybe $25, $28 with decades of experience.
I left to be a commercial building engineer. Started as a "junior" which is basically an apprentice for non union shops. I'm making around what that machinist did after 6ish years, and I could be pulling down half again as much in a union shop. Got my electrician's license, and whenever I can make time to get downtown during working hours I'll get my refrigeration operator's.
Lots of money in the right trades. But low lots of shitty low wage jobs for people with 20-30 years experience too. From what I've seen machinist tend toward the latter group.
I am curious about the folks reporting significant wages working out of their garage part time. What are you doing to make that happen?