While I've frequently hosted in my home, I've only hosted five or six first-time providers. I think it is no different than hosting someone in my hotel room when traveling and follow the same security standards as I would then. Always use the peep hole or side window to make sure they match a photo before opening the door, make sure they are alone, and don't have valuables sitting out where they can be seen. In addition, I don't drink any alcohol with this new person to help me remain alert to the situation.
As to other things, I make sure my place is tidy, including the front porch. (Since I go through the garage 99% of the time for my personal use, I've had guests arrive to find cobwebs across the front door, and they were not Halloween decorations.) I also assume that he will want to use the bathroom before we meet to quickly freshen up. Also I don't know that it is needed, but I always assume that the escort may want a shower afterwards and have fresh towels in the bathroom for him. I also have bottled water on hand to offer after the session.