Having made a career change into photography I’ll add a few tidbits. I spent close to 20 years in the automotive field before leaving and starting a new career as a real estate photographer. Sort of related, I also got tired of the constant body aches and still have lower back and shoulder issues. I’ve been into photography as a hobby since I was a kid and about a year before I left my previous career I was asked by a couple local real estate agent friends of my wife if I photographed homes and at that point I started it as a side gig pretty much working for free. My final decision to switch careers was when my wife got her real estate license. Now, a few years later, I’ve built my business and make a nice living.
If you’d like to make a living as a photographer, figure out what field you’d like to get into. Learn about the ups and downs of your subject. YouTube works good as reference, some local schools typically offer photography course, there’s also a few good books found on Amazon, all knowledge helps. But the best learning experience I’ve encountered is getting out using my camera and all the gear that you’ll be using. Rent equipment first to get an idea of what brand of bodies and lenses you like. Budget wise expect to invest $2000 plus for a good body, a couple lenses, and all the other goodies that works along with your camera. If weight is going to be a factor, because all that gear can get heavy depending on your kit, maybe look into a good mirrorless body like Sony. I shoot Sonys for a living and carry a couple bodies, a few lenses, tripod, and a few extra smaller essentials, and that kit alone weights 20-30ish lbs. Editing software I started with what my old laptop came with, then moved into Adobe Lightroom and Photoshop using a MacBook Pro.