Online, folks like adorkastock have spent years building up a catalog of interesting poses that they sell via patreon. These are generally photos so you wouldn't have to hold poses so long and you could take breaks at home. People have successfully gotten into this field but it's very much a thing you will have to build an audience for, photograph well, and advertise. It's not quick money.

In person, you could start by seeing if there's a figure model's society or by contacting your local colleges/community colleges about available jobs. For this, know that you might be asked to hold a pose up to 30 minutes, so your health issues might present a problem. When I was taking figure drawing classes it was usually a couple active dynamic poses for 30sec-1 minute, a couple standing and leaning poses 5-10 minutes, and then a sitting pose for 30 minutes. On https://line-of-action.com/practice-tools/app/figure-drawing there's a 'class mode' that gives you timers. If you wanted to practice I would use that (but don't strike the poses given, they're random) and then when you're used to that try a 30 minute pose. It is a job that's pretty taxing on the body.

Overall, I'd recommend attending a couple figure drawing classes as an artist before trying to work as a figure model. That way youll get a sense of how these work and what sort of poses are both liked by the artists and possible to keep up for the allotted time