of this board?  Have you read several pages here on the newbie board since this question is fairly common?  Do you have VIP to read the details in the reviews?

You don't need to wear a suit, but don't show up in a hoodie and jeans if you are meeting her in a hotel lobby while she is dressed to the nines.

For outcall...at least something like a Holiday Inn.  The bigger issue is that it should be discreet, and the provider should be able to get into the elevator without using a room key, and she should be able to walk in without drawing attention to herself.

A drink or bottle of water is always nice.  Ask her what she likes to drink.  Don't assume she will drink alcohol.

Do dress nicely, like you would for a important occasion:  Shirt with a collar, slacks, not jeans, and leather shoes, not sneakers.  A sports coat or sweater is a nice touch.

A three star hotel minimum is expected; and inquire first if she would like any particular beverage like wine.  Be sure the bottle is sealed when she first sees it.

I'd go with nice dressy jeans, collared dark dress shirt, black dress shoes, black belt.

Have several unopened bottles of cold water (as opposed to a pitcher of water from room service) at a minimum. Get her alcohol request, if she drinks. The etiquette is not to open anything until the lady arrives. There have been cases of drinks being spiked. Many ladies wont have an issue either way, but opening after arrival avoids an awkward moment.

If the session is going to be longer than 2 hours, I would also suggest you have at least something for the two of you to share food wise. Fruit/cheese plates work well for this. Again, though, get her opinion on this before she arrives, get her likes/dislikes/allergies etc.  

I would suggest you get the most upscale hotel you can reasonably afford that has a large, busy lobby so she can blend in upon arrival. I always ask the lady to dress more conservatively for outcall. Most providers know this, sometimes younger/less experienced ones dont so I always mention it in email. Def make sure no key card elevator. Thats a hassle you want to avoid. Tell her where the front desk is and where the elevator is she so can walk in like she owns the place.

Relax and have a great time knowing you did everything right!