[RobGR]

I have done this, with a partner once and occasionally solo.

Put up a basic web page that describes your rates. Get or print business cards. Don't bother with facebook or any form of advertising except talking to your neighbors and former customers, and the door-drop. Flyers on local bullitin boards ( coffee houses and churches ) are also good.

To do this as career or only source of income is hard. Doing it as a side gig is very plausible. You want to focus on jobs that are close by, and that don't tend to become overly complecated and take a long time. You will also want to filter the jobs a lot -- you might contact a few local repair places, and find a good one to refer people to when you are too busy or they have something you can't profitably fix.

If you start getting more work than you can handle, another possibility is to partner with another student in your situation who can take some of it.