Where abouts are you located? If you're not sure what kind of vest you'll want to get, it would be good to try on a few different styles, if you're near a physical store.
There's lots of different styles, from just a chest rig, to a little crossdraw vest, to a thin plate carrier, to a thicker kevlar-vest style (for lack of a better way to describe it), to a full blown, padded-out, plate carrier, like a CIRAS.
Try out different ones, and see how your mobility is, how comfortable it is, how good the stitching is, etc. If you're going to be playing a lot of indoor, a simple and maneuverable chest rig might be all you want. If you're going to be outdoor in the winter, you might enjoy the added warmth of a thicker plate carrier.