Follow what Deb said about the setup. Burns get infected very easily, so that snake needs a minimal setup - just clean paper towel, two hides, and a water bowl. No other décor. Clean and sanitize everything when the snake makes a mess.
Until you can get it to a vet you can apply diluted betadine to the area, mix it with water so it looks like a weak tea. If you have a Petco nearby they carry Vetericyn gel, that will also help and is better for long-term use than Triple or Neosporin for reptiles as it doesn't cause scale damage like petroleum-based ointments can. Otherwise you can order it from Amazon.
The vet will likely prescribe injected antibiotics to fight off a systemic infection, to help prevent those wounds from going septic and killing the snake.