As the title suggests, I'm inviting over a person that I've taken interest in, in playing with me.

I am in a d/s relationship that is LDR and my dom has laid out his boundaries, do's and don'ts of what me and the other person get to do.

The other person that I'm going to be inviting is aware of the dynamic I'm in so I've covered my bases on consent.

What else do I do? - explain what the basic frameworks of BDSM are (SSC and RACK mainly) - have a list of do's and don'ts - establish a no-phones in the play area rule - have a verbal and a non-verbal safeword

Is there anything else I'm missing out/can add to make the experience more enjoyable but mostly safe for me?

I enjoy the idea of making them sign a contract but then what should the contract have? What would be the legality or validity of the contract? How would we enforce that?

I'm open to any other ideas that might just help me and my dom establish safe play practices when getting involved with people outside of the two of us.

Sorry for formatting issues (if any) because I'm on the phone.