Firstly, arrange to call him at the hotel on the day to make sure he's there. Most of us do this so he shouldn't have a problem with it, you just have to look up the number for the hotel and ask to be put through to his room. I used to feel nervous doing it, but the time I travelled to see someone who the hotel had no record of was much worse.
He can meet you in the bar/lobby, or you can go straight to his room. If you chose the latter, ask him where the lifts are so you feel more confident when you walk in. Most hotels leave you alone, but you may be asked who you're visiting so it's a good idea to know the name he's booked under.
I visit hotels in something classy or casual depending on my mood/the hotel/his preference, and nothing too revealing unless requested. Try not to look conspicuous or like a hooker.
The only thing you really need to bring is condoms, your phone, and enough money to get you home if things don't work out.
I always bring lube because it's sometimes and necessary and it makes for amazing hand jobs. You might also want something for massage, but remember that oil can get around and damage condoms. That's part of the reason I like silicone-based lube, it doubles up as condom-safe massage oil.
If you have a toy you like, some men will like to watch you use it or use it on you.
Some people like to bring something sexy to change into. Personally I prefer to just wear sexy lingerie under a nice outfit unless I'm asked to wear something I can't walk through the hotel in.
You sound pretty organised so you should be fine. Good luck and have fun.