hi Mikey, my experience with NH's is they won't sign a contract until you've played there long enough to convince them they don't want to risk losing you to another client. One critical item I learned early on to include in all my NH contracts is that on duty nursing staff must be present at all times when I'm performing. Prior to this, more often than not, a member(s) in the audience might disrupt and ruin the show for the others in the audience. This has even included them walking up or rolling up in their wheelchairs to play with cables and even attempting to pull them out of the KB. If a NH expects me to be an entertainer + baby sitter/nurse warden , I'm won't play there.
My contract/invoice verbage remains simple: location, time/hours performed, payment arrangements, plus any agreed stipulations by both parties. In addition to the above, here are a few other items to consider including: onsite acoustic piano in working order and in decent tune; setup location; power outlet availability; facility in/out access; staff assistance; parking; etc.
Mikey, hope this is some help to you. Welcome back to playing at nursing homes.