I think a big one (especially right now) is making sure you and the potential IPs are on the same page re: selective reduction, number of transfers, what happens in the event of an ectopic (or anything else that would cause the pregnancy to be nonviable). It’s not fun to talk about, but so important to discuss, especially now in specific states.
I also want to mention you should ask how much communication they are wanting and the type of relationship they want. I almost just broke my match because it was going weeks without responses from my IP and I need more than that. I want to build a relationship. Not everyone is on the same page when it comes to that.