Well, start asking questions...... That's what we're here for. However, before asking, look at all the different threads about our builds so you can get a feel for what we've done, and, more importantly, messed up.
A good idea is to look at the small buses, the full-size 40'-ish buses, the coach buses, and write down (i.e. copy/paste) ideas you like and ones you want to avoid. This should give you a good foundation in which to figure out what you're looking to do. From there formulate your questions. Some old threads are really buried, so don't be afraid to go "fishing" for some information you may suspect is already on the site.
Best of wishes, and happy trails looking for your new-to-you bus!
Firearms stand next in importance to the Constitution itself. They are the American people’s liberty teeth and keystone under independence. — George Washington