>>>Besides guns and ammo what else should be brought?
Guns, ammo, ear and eye protection, & $15 is about all you need to have. At least one course each of rifle, pistol, and shotgun are the norm these days. (Rifle for the courses should generally be a "tactical" style rifle with either iron sights or optical sight with low or zero magnification suitable for CCB.)
Optional stuff would be a camp chair, quick deploy tent/gazeebo, folding table, stuff to shoot at like pink flamingos, shoes you don't mind getting muddy if it's rained recently, ballcap to keep the sun out of your eyes, rampage vest to hold spare mags, beverage and food of choice if you have a special preference, (they usualy don't have diet soda or caffine free cola; food is usually fried chicken or burgers), camera if you want to take pictures, and a vehicle you don't mind driving on a rocky road.