First shoot, if its a big one they may make you shoot penalty yardage if there are minumum target requirements. That would be from 23 yrd line. Your beginning ATA yardage will be 20 Yrd line. Also if you are put in Classes for singles you would go in B class (as penalty because you don't have targets to average). ATA fees are ussually $5 per day not per event. They will ask you if you want to play any OPTIONS. This is ussually a bet. Lewis class pays off for all level shooters and is an ok gamble if you choose. If registration starts at 9:30 shooting will probably begin at 10am. Some clubs shoot doubles, singles and then Handicaps, and otheres shoot singles the handicaps followed by doubles it is at the clubs discression. There will be alot of hurry up and wait at shoots its just the nature of the game. You should be done shooting by I would say 4. and all this depends on how many shooters, how many traps there are but I ran throught the ATA website and I can't find the particular shoot your talking about so its probably not huge. At Cardinal forinstance they shoot 3 events a day averageing 500 shooters and all is done but the shootoffs by 4. But they also have 48 traps. I shot my first ATA shoot almost a year and a half ago and it was at the silver dollar a week after I shot my first round of trap, and I was tickled with my 79/100 in singles. If you ask 10 people what chokes to use you will get 10 different answers. When I started I wanted an open choke because I felt it would help my lack of accuracy, but thats just not so, use an full choke from every where and smoke the snot out of them. Bottom line you have to start somewhere and this is it just think the next time you feel this nervous is when you call for your hundreth bird to run them all. any specific questions feel free to PM me and I will give you the scoop. I am not an expert but still remember my beginings. oscar suski