In order to receive Components for crafting you need to build the Scavenger building in your camp which you can only build when your Council reaches level 15.

Components can occasionally be found in the crates you get after each mission. Without the Scavenger building, you won’t be able to find Components.

You can also purchase crafting Components with gold from the in-game Shop, on the Components tab. There are several different offers, which can help you to get more Components!