let me jump ahead and tell you the sum of what everyone will tell you...
theres cheap gear.. which will work well for what you need it for. which is to hold all your stuff.
you'll need to carry (in a serious game) magazines, extra BB's, Radio, pistol and mags (if you use one). WATER. (GET A CAMLEBACK THERE IS NO COMPROMISE ON HYDRATION) my team requires things like a whistle, a multi tool, med kit.
an "infinity" vest and pistol holster from Jungle Toy work just fine for everything. (i use one now, but will soon make a chest rig) 60 bux will get you a vest, sling, and drop-led holster. the vest has a pouch in the back for a water bladder. i have a pouch for the radio on my back, and a pistol mag pouch on my belt.
then you could go with things like blackhawk and condor which are more money, but customizeable, and "cooler". then theres things on the very high end, but ill let other people tell you about them.