Are you the trained and experienced Adult Lead on this outing? If so, you already know what you need.
In Scouting America, Lead Climbing is limited to Venturers and is NOT conducted at at Troop Level. Trained adults with lead climbing skills may need to set up top rope anchors. If so, they should be aware of the gear they need. This list is to give you an idea of what is needed for a climb.
Helmet
Harness
Climbing shoes
Chalk bag
Dynamic climbing rope
Rope Bag
60m+ Rope
IKEA bag is popular for carrying rope
9x quick draws
Belay Device - Cam-assisted preferred
Petzl Grigri or Edelrid Pinch preferred
Assisted braking features are the standard at may gyms and climbing circles
There are many others that can be used per user preference
Black Diamond ATC Pilot
Excellent belay device for lead climbing - may in fact be the best one to use for lead climbing
Assisted braking devices without cams or moving parts
Can be used left handed
Works differently than other braking devices - so you should NOT try it out for the first time on a lead climb with us!
Black Diamond ATC Guide and Petzl Reverso
Multiple uses in climbing world
Rappelling with one or two ropes
Multi-pitch
Belaying from top
Ascender
Light weight
This does NOT have assist feature and requires constant focus and should only be used by instructors experienced with this device
3x extra locking carabiners
Personal anchor
Petzl Connect Adjust Lanyard preferred
Dyneema Anchor Chain (NOT Sewn Daisy Chain!)
Anchor material
4 locking carabiners
4x slings or 7mm alpine cordelette to build anchors
120cm Dyneema sling to build a quad anchor
240cm Dyneema sling are also great and don't need to be doubled up to build a quad
Belay glasses
If rappelling - ATC Guide or Petzl Reverso
A dedicated Crag Bag will help you keep your gear organized, stored and clean.