If you start playing regularly and would like to have your own equipment, you have several options open to you. Buying a used pump action gun and a new pair of goggles is a good start. Buying yourself a new pair of goggles designed specifically for paintball is necessary. You may go through several hundred pellets of paint over the course of a single day, so this cost should be a long-term consideration. The minimum safety equipment necessary is goggles, facemask with ear and throat protection, and, for men, a protective cup.
Proper footwear is very important.
Some players find that lightweight canvas topped army boots or leather workboots protect feet and ankles in the woods. Other players prefer the support that sneakers give as paintball does involve running. For the first few games you should play on a well-organized field. Size is not the best way to judge the field. The things to watch for are the number of referees on the field for each game and the explanation of the rules.