Shoot the other teamIf any of the other teams going can give any advice or pointers then all info will be greatly received.
Nah, in all seriousness, make sure you take plenty of time to walk the field and thoroughly go over plans. You'll need to work out shooting lanes, primaries, secondaries, zones, lock ups, blind shots etc as well as several different breakouts.
Play smart paintball: don't give the refs a reason to penalise you as they are extremely strict and especially as you're playing M5 you really cant afford to lose unnecessary bodies.