Hi ,
Speak to steve Bull of our UKPSF he will set you no the right track you should become a member site there are lots of good reasons to do this, way too manty to list here. Steve will be at the Zap indoor this weekend but if you call him monday 07973692379 and he will be able to get you sorted any help you need he's your man.
You need to work out how many sets of kit and bearing in mind you can always hire in extra stuff if you get a busy day rather than spend thousands on kit sitting around and not being used.
Your guns goggles ect will be the most expecncive investment bearing in mind if your lucky goggles will last a couple of years and if you look after your kit it will last longer so make sure you train your staff right
You need to deside what guns ie tipmans or infernos they are the most popular site guns new or second hand?
I would contact all the paint suppliers Diablo Direct Europe 01273696700 , nelson I think you need to speak to Rob at TVL Reading, WDP birmingham, RP Sherar Powerball andover, Zap Phonix Paintball, Server Jon Payne JCS lesuire Elsham, they are the main suppliers there is lots of weird and wonderfull
cheep paint on the market at the mo but you get what you pay for! See what deals they will cut you and ask there advise on storing your stock especially if you decied to run walk on days as the players will notice the diffrence between good and bad paint.
Good luck and like I say ask Bully he's brilliant