[EricH]

Safety glasses and other PPE.
Training on any tool you get.

These are the most important things you can get. They can prevent injuries if used properly.

Now, as for tools:
Drill press and drill bits.
Cordless drill and second set of drill bits.
Allen wrenches (1+ set of both English and Metric sizes)
Phillips/flathead screwdrivers of various sizes--a 4-in-1 might be a good option.
Chopsaw or bandsaw.
Hacksaw.
Hammer/mallet in various sizes.
Crescent and box wrenches in various sizes.
Tape measure.
Level.
4x block of wood (for putting the robot up for testing).
Scale. (Trust me, many teams have weight problems. Don't join them...)