I only how to host the retreats at B&B's, but gained a lot of experience from working with the lodge owner!
Start with making sure you can even do this in your home. THat means talking with your insurance company!As well as local zoning commission. FInd other B&B's and retreat houses and correspond with them!
YOu might consider hosting Retreats for a year to see how things work out!
For teachers, you need to start LOCAL...find the teachers that are available quickly and closely as they will be easier to book right away and not be too costly for you/attendees!
Then get ideas to maybe host 1-2 BIG names during the year. Remember, the bigger the name, the longer you have to wait to get them, and the more you need to pay up front to reserve them!
I wish you well on this adventure..it is not easy, nor is it for everyone, but if you really have your heart set on it, and you are dedicated to doing the research/homework, then you will reap some mighty fine rewards!