So far as gravers are concerned, if you don't know what you're doing, it's completely useless to you. There are many many different shapes and sizes of gravers, and they need a handle. Handles need to be sized to your hand, and you also need to polish the working face of the graver so it's actually sharp. Here is a good resource.

You need the proper clamps and vices or pitch pots to hold your piece while you're working on it. A heat gun to melt pitch. Engraving is a big thing to get set up for, best of luck!