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Ride height refers to your frame height where you will do most on your driving. On a street car (truck) to be practical 4" seems to be a good average. Whatever number you come up with set the frame on blocks, figure tire height and set your rear on stands and build the suspension from there. Mount your bar (lower bars if doing a triangulated 4 bar) level to the ground. Do your bag mounts keeping in mind your max aired out position. Set your pinion angle the same as your transmission output angle only opposite. 3 degrees up on the pinion and 3 down on the transmission is preferred. Whatever the trans is the pinion must match. You also should build for as little change in pinion angle as possible through rear end travel. Tack everything and cycle the suspension making sure the angle stays consistent. I built mine at 4 inches but spend alot of time at a much lower height, mostly hwy driving. Because my pinion changes very little and my bag mounts were mounted to account for it not a problem. Hope this helps you out . .
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As for bag pressures, i really had/have no idea how you would figure that out. I used 9000s on the back and just made sure they didn't bottom out and used bump stops for my max down. Front i used 2600s and Z'd the frame. I run 50-60 psi front & rear and never over 80psi.