Don’t rent an office space. You dont have the runway to make that work given the current tech market. Focus on getting a solid enough job to get you actual housing. Temp agency, county jobs program, take anything that will pay you a living wage and provide stability.

> I only have a desktop.

Sell it. It's a paperweight for you right now. You can find a really nice open-box/used laptop for $300-400 that will allow you to work from anywhere. You can charge the laptop at a cafe or a library. $5 for coffee and you have a working space to take calls and work.

DC-AC Inverter will let you run the laptop from the car as a last resort..

Usually there exist also dedicated car chargers for the lighter socket.

will cost you energy though, making battery less reliable or wasting fuel. Best to charge where you get energy for free.

Chamber of Commerce is swimming with other hungry sharks. You'd be better off finding a coworking space (NOT a chain one like WeWork). Talk to the owner and explain your situation, ask for a month or two discount while you get your bearings and attend every meetup they have. Meet everyone, tell your story, share your skills. A small community will help take care of you in ways a CoC will not.

Kiln just opened in St George, I have a dedicated desk, but they have non dedicated desks for I think $150 or so, and has more amenities (and free snacks/coffee to save a little on food costs)