just a pair of boots or trainer boots and hire is best advice
it ain't as expensive as paintball to try it out for a day
bag of ammo is like a tenner for 5,000 bb's - plenty for 2 days shooting
don't rush out and buy a 2-tone pile of crap from a website with BB in its name ffs
you need to spend £100 to £150 on a starter gun - but try it first
stuff like a full face mask will be supplied - probably G36 gun
all you need is a pair of boots & a bit of common sense for safety
get out there & get shooting