Welcome hebrewhammer, I attended AVN this year as well (it was my first time there) and had a great time. That is a great warm up to get you ready to visit Sheri’s where you will have a whole different level of fun!
1) I would recommend just visiting with the ladies in the bar so you can get a better idea of your chemistry with them. A lineup is very intimidating when you have 20+ ladies up there looking at you, especially on your first visit.
2) Yes, you could safely count on it doubling.
4) Yes, just be aware the ladies all have varying schedules…some may be eating dinner, some may already have gone to their room for the night, but you will still have a fair amount of ladies to visit with in the bar and if you are looking for someone specific, just ask the hostess.