For equipment you would need a servicible handgun, some type of holster, magazine pouches although you can use your pockets, at least 3 magazines or speedloaders and at most matches around 100 rounds of ammo. Eye and ear protection is mandatory!
You might also consider bringing drinks and snacks to most ranges.
No competition type equipment in either guns or accessories. No ports, comps, electronic sights, competion holsters etc.
If you can honestly say "I would carry this as my everyday concealed carry gun and equipment" then most clubs will at least let you shoot your first match with it.