Thanks Dreamcatcher. I think that this boarding agreement will turn the tide and make them take it seriously. I will be charging pretty much the standard rate for the boarding facilities around here, some of which have nicer places than I do (I'm not set up for boarding and don't really want to do it).
I think that why they haven't been serious about things is the fact that everything was free. My time and knowledge to run around and help them find the horses, my time and knowledge to teach them how to care for the horses, riding lessons, use of horse trailers, board and pasture, stall cleaning, feeding and watering, teaching how to tack up, tack storage, etc. etc. I don't regret at all helping them, I like to help people. But when I say enough I do want to be taken seriously.
Again everyone, thanks for your support! I hope this all turns out well and we can maintain a friendship, but after considering what everyone says, I think I get it!