Are you LE? If so, a short list would include items such as Dope Book, Mildot Master, Range Finder, and a decent set of front and rear bags. Once you go to a Fieldcraft school, you will get a better grasp on what you will need/ prefer. Don't go crazy on gear until you go to a school. Hook up with other teams in your area and pick their brains. Schedule training days with established teams. See if your Department will allow you to contact companies for T&E equipment.
My best advice is this: If your Department won't supply you with the right equipment(SPEND THE MONEY), then don't even bother accepting the liability.