As much as we love it, it isn't for everybody.
Before you get too far, rent a coach for a week and make sure it is something you really like.
As a solo traveler, at least you won't be crowded.
Now, Buying used is smart, but don't spend money until you really know the condition of the coach. Never pay the asking price. It doesn't matter how nice it looks, you will probably have to plunk a couple of grand into it before you go anywhere. I don't know how to find a good surveyor/inspector, but probably someone here can.
There are lots of things you may not have thought of, like legal residence and how to handle mail. These things can be managed, but you have to set it all up.