I would be careful with off site leases. I leased out my old mare once, it only lasted a month. The leaser admitted to essentially beating my horse into the trailer to move her to a new barn (that I did not authorize the leaser to move her to). There were several other red flags that came up as well, and so I went and picked her up. She loaded right up into my trailer, and I never let her out of my sight again. I have personally done two on-site leases and the basics were, I was responsible for a portion of the board (both horses were used a couple times a week in a lesson program), and since I wanted to show I was responsible for getting shots and coggins done. Both leases included use of tack, but I owned a lot of my own stuff so the only things I used were their bridles.
Sydney, Appaloosa x Draft cross