Guess you have some reading to do.
My wife wanted NOTHING to do with the bus until I started looking at flooring, colors, appliances...
1) get bus mechanically sound- it's a trailer if it can't go from point A to Point B without a tow vehicle
2) Tear-out/clean-up and tackling rust
3) Address too many windows, learn to rivet.
5) Build out.
6) RV plates