I have been paintballing too. Thing is, you need to be aware of your surroundings. If you want to play properly and want to put come CS into it, then i suggest looking everywhere all the time. I went Delta Force, they provide equipment like clothing/armour for free. But you have to buy grenades, M4 carbines and paintball pouches. The pouches are there to store some extra balls. M4 carbine has a better accuracy with an iron sight. If you won't get any free clothing then wear something like this:
Bandana around your face (Not really needed but it will cover your face and make you look like a baws.)
2 or 3 Jumpers, the more you can wear the better, this includes hoodies since you want heavy layers to protect you from the 100mph paintballs. And trust me, they hurt, i got shot in the neck and it left a bruise for a week or something, really painful

1 or 2 thick trousers or tracksuit bottoms. Try to wear stuff you are not worried about getting dirty, since there most of the time will be muddy environments so you do not wanna worry about where you crouch/prone to keep your clothes clean.
Shoes. Some nice, hard, running shoes that are sort of like rain boots will be good to make sure mud doesn't enter your shoes and once again you do not need to worry where to step your foot, just run like a mad man

Gloves can be helpful to make sure you have a secure grasp on your gun, most paintball centers sell gloves which are made for paintball purposes, better than normal gloves.
That is the clothing done.
Now to focus more on your gameplay.
Paintball is not as easy as it seems in CS 1.6. You have no iron sights, so shooting with accuracy is a bit hard at the beginning but you can get used to it after 1 or 2 rounds. As i said, the M4 is much better with accuracy so if you can get that, it will help
Rushing :
If you want to rush, then make sure you have a good 2 or 3 friends to help you. But obviously do not run in open fire. Try to flank rush, go around the sides and slowly catch up to the enemy, while keeping low and try to make noise levels down. If you are spotted, take cover, wait after they fire a few paintballs, all paintballers start going trigger happy so just wait until they are reloading or not ready then catch them out. Once firing, do not just stand there like a statue. Make sure if you are behind cover, duck and shoot, duck and shoot. Main thing is, make sure you have cover. Then once you have a good advantage over your enemy (example : they do not know where you are) then just spray

Time your runs between each set of cover, communicate with your teammates as much as you can! When i went paintballing, no-one listened to me, so i went solo every round
Solo :
Now if you are left alone or your friends are just being pricks

Then best thing to do is take it slow. Get to cover, wait a bit, peek around to see enemy positions then when you think you are ready, take them down one by one. Try to save your ammunition, since you have no-one else to shoot for you. It is possible to solo in paintball, i did when my friends just abandoned me

Just take it slow, keep low, always make sure you know your surroundings, track the enemy and just take it from there. If the enemy spot you, best thing is to take cover and wait patiently. It can be quite scary, for me it was, i was just sitting behind a square wood fence (whatev you call them

) and i see 100's of paintballs flying past me. If you are in a situation like that, keep calm, time your move and take charge

Defensive :
If you wanna play defensive, best thing is to take cover! ALWAYS take cover, try to be invisible to the enemy. I will give you an example of what i did when i was left alone near the back of the starting area of my team :
I sat behind a wooden fence, and just sat there trying to listen for enemy footsteps. At the time i did play counter strike so i think it helped

The enemy came in closer into my position. They didn't know where i was. I tried to listen where each one was, it is quite easy since most paintballers run to try and avoid shots. I peeked around my cover, saw them closing in. But they weren't too close. I shot a bullet into the sky, they saw where it came from and ran to my cover. By the time they came, i was behind a bush, i had to time it as i said before. They were looking around but couldn't see me. Then i popped out and took them all out

They all screamed and lifted their hands up.
Well that is a good example from my experience, take it slow, make no noise, time your move, trick the enemy and then take control of the stage

Well i would go more in detail but i think this is enough. You will discover your style of play when you play. Paintballing can be close to counter strike, if you think tactically. But if you try to implement a few things from it it may help

This is if you plan to play serious. If you wanna play for fun, then just run like a mad man, test your luck and try to win
Well i played serious since i didn't find it fun being abandoned a lot -.- but i did win for my team.

If you wanna know anything more, ask me

And good luck and have fun at your paintballing, i wanna go again and i am sure you would wanna go again too after you go for your first time
Moved.