Things you may need to go shooting:
Guns & ammo (not the magazine)

Extra ammo in case your friend Bob forgets his.
Bring your pal card, club membership card, and registration certificates
A bag for your gear
spare magazines for anything that uses them.
pistol case, trigger locks, & a lock for your case
targets and a pen to date or score targets
a screw driver for adjusting sights
allen keys or other small tools you may need for dissembly
stapler & staples
target patches or tape for covering holes in targets
safety glasses & hearing protection
cleaning kit
A rest or sandbag for sighting in or testing ammo.
People go to the range without their keys, I have done it my self. It is a good idea to put your trigger lock, and pistol
case keys on with your car keys. A person could also use combination trigger, & case locks.
Some shooters bring spare parts to the range, such as extractors, recoil springs, & firing pins.
When I go shooting, I always take a rimfire pistol and rifle with me, they are too fun to leave home.
One week I bring a S&W 41, and a CZ452 Varmint, The next I bring a MKIII Target, and a KIDD Ruger 10/22.
I like red dots on pistols and scopes on my rimfires. (My eyes suck!)
I do often bring Food and a Drink as well.
A first aid kit in the car could not hurt.
I am also going to get a soft blow hammer, and a piece of brass for squibs.