Im pretty sure there are some sample contracts somewhere, or on stallion websites, the downloadable forms.
I would insist on the mare being tested "clean", would include a liability clause, then maybe Life Foal Guarantee, price for service and keep.
I, personally, wouldn't count on maiden =clean unless it was my own and never has been with geldings or young colts. But that's just me. I've seen a whole breeding season ruined due to a dirty maiden mare. Losses were high in the 5 digits for that stallion owner.
Did you find a stallion site with PDF contract?
You're welcome... now since I'm trying to read between the lines... your stallion has bred before but never to a mare that has not been a part of his/your herd?
Did I read that right? I'm wondering, which is why I ask these questions, what experience you have in breeding stallions to mares... not the reverse. There is a difference. As the stallion's guard you'll need know a tad more about putting him together with mares you know little or nothing about personally.... other than if she is healthy. A fine stallion, capable of breeding well for years, may be inhibited severely by an encounter with certain mare behaviors... not only during the cover of the mare, but for time to come. Any stallion who is capable of pasture breeding without injury to the mares is worthy of particular care. Any mare incapable of responding in kind to Gentleman Jim needs a close eye kept on her.
Cowboy, I don't breed to outside mares only to my own, I pasture breed mostly, I have hand breed a couple of my mares to him before, he's gentle and likes to romance. He's been with my mares for years and has been in the same pasture when they foaled. He's not a youngster. And this will be a cross breeding of a Standard Bred mare and an Icelandic stallion, she's 16.3 he's 13.2. I'm not sure if I'm going to do this breeding or not.