Melee weapons can be easily found in almost any building. To “equip” it, means to put it on your back. Do this by holding it in your hands, hovering over it and pressing
.
Firearms are usually found in police stations, military bases, or just regular old houses. The first firearm you will most likely stumble upon will be either a Rifle or Pistol of some kind. Like before, hold the firearm in your hands, use
to hover over it, and press
to equip it, aka putting it on your back.
Backpacks, for me, are usually found in sheds outside of houses. It can be any backpack, school backpack, hiker backpack, etc. simply pick it up, and if you don’t have one equipped, it will automatically equip it for you.