In CT, Paintball on State-Owned or Federal Reserve property is illegal.
The marking of trees with paintballs is considered vandalism and if you get caught, having all your gear confiscated will be the least of your problems.
If you try to play on private property without permission, you risk having the landowner stand on their second amendment rights and protect their Property & Privacy through the use of firearms.
The best you can do is find a landowner who is willing to accept the liability and allow you to play on private property.
Otherwise you risk being either arrested or shot at.
Your best bet is to go to a legitimate paintball field that has insurance, refferees, & a safe place to play.
All of CT Laws & Statutes are on file at any public library, I suggest you look them up before going out & trying to organize your own paintball games.