At your local field hang around the players who look like they know what they are doing. I suggest steering towards the players in jerseys, not camo. Most experienced players realize that camo is minimally helpful at best so they tend to opt for lighter weight clothing that helps them move faster. By and large paintball is a extremely helpful sport, players are willing to help each other.
I could write you a whole book on things I think can help you on the field but reading and doing are two very different things