1. You do not turn new rotors.
2. All the rotors I have ever gotten I just take them out of the box and install them. I have never heard of an ABS ring and if mine do have them they came with them in the box already installed.
3.Not sure about the size. The guys at the auto parts store should be able to tell you.
4. You need to get a can of brake cleaner, and grease for the calipers. Make sure you get both. Clean the rotors really good with the brake cleaner (back and front). Then make sure you use the caliper grease.
2002 XLT 4.0, 3"BL, 295/75/16 Nitto Terra Grapplers, K&N FIPK, XCAL 2 w/LaSota Racing Tune, 2 12" Alpine subs, Alpine Deck, Cobra CB, Low Pro Tool Box, Straight Pipe Exhaust, Blacked out heads/corners, Expo OHC/Dome/Cluster, etc...
2011 F-150 XLT, 5.0 Coyote, Hell Bent Steel Leveling Kit, 15% Tint, Flo-Pro Super V Exhaust, MA Audio 1000w amp, 10" Sony Sub