The best bet is to just play more and see what you "really" need. Like, if your mask fogs up all the time, you might need a need (thermal) mask or Fogtech. If you keep playing, over time you'll probably go to compressed air, instead of CO2, and probably upgrade your gun, unless you want to stay in that setup.
I'm sure we could provide advice at different levels. Fancy jerseys and pants would be least important, although pants do provide benefits (like protection and wear resistance).