We need more info, engine size, gas or diesel, transmission. Have the brakes been serviced? If not its past time i would think. I would plan on replacing those tires. About $400 each. I see a rusty bus issue already. The bottom of the door has rusted away. Imagine what may be lying under all that floor covering. Hopefully the bus body has a metal floor and not a wood floor. Just going by the pics, if it runs good, I may offer at most $1500.