Just a couple good tips
1- Communication- It is the most important thing in a match. if you do not talk to your team and your team does not talk to you, you will most likely loose. You want to know where the players are at all times. So don't be afraid to yell it out, even remind your team by saying multiple times.
2- Location- if you walk the field before a match you are bound to find blind spots and angles. You want to use them to the best of your advantage, then have your team cover you as you progress up the field. Always be aggressive but not stupid, make the move with the right timing and you will take them by surprise.
3- Balls- Whatever you do, DO NOT BE AFRAID. people have to learn that paintballs only travel 300 fps, from across the field you can dodge and out run them. once you learn the art of that you are set. So do not sit in the back an be afraid to pop out, hell even run up the field bunker a few kids just don't be afraid it doesn't hurt that bad.
4-Snap Shooting- this is all about the right form. Pop left side gun is in your left hand, right side gun in right hand. ALWAYS keep your trigger elbow tucked tight as well the whole lower half of your body. if you get this down all that should be seen is half your face, your shoulder and part of your elbow. keep your hopper at the same angles the bunker, and try to resist popping the top because you will most likely get faced.