as a few people have said
first get a mask, make sure it has a thermal lense. you cant go wrong with a dye, jt, empire or v force grillz etc.
personally for a first gun, you cant go wrong with an slg or pmr, get the best possible hopper you can afford and a second hand fibre wrap bottle
get hold of a second hand pair of playing pants and maybe a jersey, also a pod pack you can get for dirt cheap, then you are physically able to play.
look around in the FS section, see what you can find. if your looking for a pack, pods, mask, jersey or bottle, pm me as i have some spares lying about