air over leaf, what am I missing?

[fpjr0]

hi I have been reading around, and I have decided to air bag my truck, this will be my first air bag install, but I am familiar with the system (I work and drive in a big rig?, here is what I am trying to do, please feel free to let me know what I am missing.
1. up front 2.5 drop spindles and replace springs with cups and bags truck on 20's
2. in the rear, flip kit, leave only two leafs, add a 2 inch block to make it a little lower, add a bolt on notch, and do the air sleeve type bags from leafs to frame, now,
I really dont care for having the ability to raise my height, but I would love to be able to drive almost having the axle on the frame with some air on the bags to have a good ride,since I have never had a p/u on air, do I have to install the bags right on the leaf or maybe higher or lower, I hope I am making sense, thanks in advance here is the victim truck