1998 Chevy Tahoe general

I, am thinking about buying this vehicle. I, am concerned however because it has not been started for 5 yrs. I, ve given a lot of thought and talked with sev. Shops about it. If you can give me any advice as far as the best way to go about preparing to even crank this thing over, i.E. Pulling plugs and injecting oil or something into the cylinders prior to starting. Besides the obvious oil and filter what about the cooling system and all the the other fluids, transfercase, transmission, brake, power steering, ect. What about the other things that have seals and gaskets that most likely have dried out. How long should the vehicle be run before these things have had enough pressure put on them to see whether or not they are OK or not. Thanks for any reply