A recent video from Chris Koerner…
- I Found a Perfect Business That Anyone Can Start…
It’s a firewood business, and Chris lays out how he’s helping two college kids get it off the ground 
One commenter writes…
Wow! That’s the most comprehensive 30 minutes video I’ve ever seen. Absolutely jam-packed with useful ideas, most of which would be applicable to any business!
Biggest starting cost is a log splitter = approx $1600.
Get the raw firewood free from tree trimming companies.
Cut it up and sell by the half cord = one full truck bed = $250-300 revenue 
Chris shows how to do competitive research and find customers via Facebook Marketplace.
Probably a lot of local service businesses you could try with this approach, maybe copy Chris and have local college kids do the grunt work while you oversee everything 
Bonus: if you live on a busy road, check the 16:20 mark of the video to see how you could make money by letting people advertise in your driveway.