Elimination/Getting Out
Most, if not all, fields will use tournament rules that are decided by tournament leagues like NPPL and NXL. According to their rules an elimination occurs when "A player is eliminated from the game when he is marked anywhere on his body, clothing or equipment with a quarter-sized or larger splat caused by a direct hit from a single paintball." When you are eliminated, you will be asked to quickly walk off to the side of the field where you can watch until the second round begins.

Safety On The Field
Never use equipment that is not rated for paintball use. This is especially true of masks because not all masks are rated to take the impact of a paintball at 300 fps. Always pay attention to the field safety briefing at the start of the day. Each field may do things a little differently but for the most part you will be expected to keep you barrel plugged or covered at all times unless on the field. Never take off your mask on the field, EVER. Removing your mask will result in your removal from the field for the day. Lastly, you will need to keep your speeds/velocity of your paintballs at the posted speed on the field. Usually speeds are kept well under 300fps to prevent a mask from being broken. This is done at the chronograph, a machine that uses radar to rate your speed. You must always chronograph in front of a ref before play starts.

The Field Pieces
If you are playing on an Airball field, you will notice all of the inflated bunkers. These are made of heavy weight materials that are designed for paintball. These bunkers can be shot and are designed to be your protection but if you are not careful you can be hurt. These bunkers are anchored down with stakes that are underneath the bunker. Be careful of them when you slide into a bunker. If a stake is exposed or if you accidentally knock the bunker down, just bring it to the attention of a ref.

Field Conduct
An important factor in have a good time is how you and others act on the field. A big point is not arguing with the refs. If you feel you have been victim of a bad call, just calmly explain to the ref that you want clarification of what happened after the game. The refs are there to help keep the game moving and fun, but at the same time, they want to keep you safe. So in general, don't argue with a ref.

Swearing on the field is not allowed and as a rule of good conduct, watch what you say. A lot of kids and young adults are around you and fields don't want that kind of language being picked up on their field.

What to bring on your first day
You will want to wear clothes that you don't mind getting dirty/ruined. You also will want to bring stuff like your mask, paintball gun, air tank, barrel plug, and some tools, if you plan on using your own stuff. If you want to rent, then just bring yourself and some money. Also you may want to pack a lunch and some cool water to drink for later in the day. You may be able to buy these things at the field but they will be a little overpriced.