Donny: The original concept was to do one compound exercise each workout and that was it. Might be something like; Mon-bench, Wed-squat, Fri-BB Row, based on once a week training a single body part. Whatever one exercise is selected per workout day/body apart, is up to you. Just make sure it's a true compound exercise, no flys, lateral raises. leg extensions, etc.
Pretty simple stuff, but can be a drain on body and mind after a serious workout. If doing the bench, on a GVT day, than select a weights that is much less than a normal weight for the bench. Say your normal bench is 230X8-9 fairly easy to handle reps. Drop the bar to around 150lbs and keep that weight throughout the entire 10 sets. If you can't make the 10 reps on the middle to last few sets, than you lose...your starting weight is too much. Next time chose a lower starting weight. Don't worry, you will be getting much stronger as you work into the this system. Usually 90 to 120 seconds rest between sets. Don't try to select a starting weight by that % of weight used stuff, that's just so much crap. Everyone is different in selecting any weight for anything. Just have to experiment a bit with the bar.
It's really about doing a 100 reps per exercise, divided by 10 sets (or breaks, because that's what sets are). Actually BB'ing is about how many reps, rather than sets, in any style workout, if you think about it. Squats & DL's can be very productive with a GVT system. Size, power and endurance all rolled into one.
The theory of the start of GVT was with central and eastern European weight lifters. For their off season training and a relief from their normal heavy load training. Some lifters had increased their bwt, moving to a higher weight class from this style of training. The usually method for them was something like; Mon-press, Wed-front squats (exceptional exercise), Fri-cleans or snatches. Some did regular BB'ing style exercises, like benches, rows, etc..
There are other versions of GVT. But the original may be the better method for most people to explore. This is a true K.I.S.S. way to train. Good Luck.