Crowbar, almost need no training with it.
(duel) Katana or a sword, would need some training or some time to get used to it.
I would be average with an rifle, better with a pistol (duel pistols would be good).
I could train with a rifle/sniper rifle but I would need a trainer or alot of time with it.
Explosives, BOOM, just need instructions.
For me I would be good with bladed or blunt weapons but okay with firearms, but I dont think we would find any ammo or firearms, but Melee weapons are common as dirt.
I would be perfect for a leader of a group.