I don't know the things that you may want to know, but if you can think of anything, do write them down. When I went for my consultation last month, when put on the spot I couldn't think of any questions. Mind you, I didn't have many cos I'd researched it for so long, but its easy for the mind to go blank.
If there are specific things that worry you, don't be afraid of asking about them. Hope it goes well!