In order to start crafting you will need the correct tool for the Tradeskill. Each Tradeskill will have their own kits to use based on type, (Animal Training Kit, Starter Weaponry Kit, Basic Ballistic Kit, Intermediate Cooking Kit, etc.). You will need to have the correct kit in your pack in order to craft/use that Tradeskill. These kits can be either crafted or purchased from a merchant.
Another option is to purchase the "Commander's Best Tradeskill Kit". This can be used instead of all the above mentioned Tradeskill kits and it can craft any recipe in the game. The "Commander's Best Tradeskill Kit" can be purchased off the Fallen Earth Marketplace or the Reward Points Merchant in-game.