The Guild of Mysterious Order
A basic page on crafting, as I've never researched this myself until now. Essentially, you can make anything you'd like. However, different types of items have different levels of difficulty to create them. You get to specialize right now in 2 general crafting types, which I'll let you choose permanently by next session.
In order to craft an item, you will need one item of each level up to the level of the item you're trying to craft (this chart helps show general levels of items). (IE, to craft a level 5 item, you need to take apart a lvl 1, 2, 3, 4 and 5 item to gather all the materials). All the cyphers you find also count as items of course, and are usually pretty decently leveled.
There's not a lot of specifics on crafting in the books, which pretty much means it's up to your imagination almost fully, and me approving based on the physics of the world and what's at hand. You could potentially use the Guild's Resources in exchange for giving back in some way.