Suzie, it sounds as though you've given this a lot of thought and are willing to diversify to fill those beds. Also, you wouldn't be dependent on this for your sole income and, in fact, have other income to support yourself and your dream venture. You're way ahead of the game so far.
I'd contact other retreat owners far outside your own part of the country (non-competitors) to see if they'd be willing to talk to you about their bumps and victories on the road to success. No one can give you better insight and advice than someone who's doing exactly what you dream of doing.
Best of luck to you and please keep us posted!