A good reference checklist for Noobs and Veterans alike:
RE
Skirmish Checklist
Weapon
-AEG / Springer / Gas
-Primary / Secondary / Backup
-Fully Charged Batteries / Gas
-Ammunition / BBs
-Magazines
-Scope (w/ batteries - if applicable)
-Sling
-Orange / Black “flash hider” (always transport and store your weapon with blaze orange)
-Gun Storage (never transport uncovered)
-Repair Kit / Tools (multi-tool, hex wrenches, etc.), spare parts
Uniform
-Blouse / Shirt (black & green/camo)
-Sweat Wicking Undershirt
-Pants
-Belt
-Boots
-Head Wear - Cap / Boonie / Helmet
-Scarf / Shemagh (optional)
-Balaclava (optional)
-Thermal Underwear / Outerwear (seasonal / when appropriate)
Gear
-Vest / Plate Carrier
-Mag Pouches
-Misc Pouch (for your car keys, license, etc.)
-Mag Dump Pouch
-Hydration + Carrier
-GMRS / FRS radios w/ charged batteries
-Headset (optional)
-PLENTY OF WATER
-Backpack (optional)
-Watch / timepiece
Safety
-Eye Protection - Safety / Shooter glasses AND/OR full seal Goggles (ANSI Z87.1 certified)
-RED “Dead Rag” (bandanna, cloth, etc.)
-Knee Pads
-Gloves
-Full Face Mask (optional)
Administrative
-Legal Release / Waiver
-Emergency Medical Contact information
-License / ID
-Field Fee (when applicable)
Optional
-First Aid Kit
-Food / Snacks, Cooler
-Trash Bags
-Tarp / Foldaway Tent / Awning
-Mouth Guard
-Eye Wear cleaner and cloth
-Spending Cash for Vendors
-Duct / Electrical tape
-Paracord
-Charger w/ appropriate adapters
-Pen / pencil & small notepad
-Change of Clothes / Shoes
-Foldaway Chairs