Walk the fields with a good team, find a div1/2 team just stand around listening what they are saying, most teams wont mond a KOTH team taking some free advice...
Get all your paint potted up ready before the games start unless you have a pod bitch for the day!
Make sure everyones guns/tanks/hoppers are ready to go and everyone has spare batteries e.t.c
Ask marshalls about anything youre unsure about as thats what they're there for
Make sure you get the captains meeting in the morning, in fact get your whole team to go as its your first time otherwise it can be alot for the captain to take in.
Take a tool kit cos you inevitably need it!
Make sure your back plays shout alot as they are the eyes for the team, most KOTh teams have appauling communication as its very difficult when you first start to get your head round everything let alone be telling everyone else what to do.
And finally get there nice and early too many people turn up at last minute which means no time to ask questions/sort equipment out/sign in e.t.c
Good luck mate, hope you enjoy it!