Small tools gathered being, at minimum:
Wrench set
Screw driver set
Battery operated drill and assorted drill bits
Hack Saw
Allen set
Next I would acquire tools that are more specific to FRC that your average garage wouldn't have; mostly electrical tools and supplies would fall under here:
Various spools of 12/16/18 gauge wire (In both Red and Black/Blue)
A decent crimper (Preferably a
ratcheting one)
Soldering set
Assorted insulated connectors
Assorted motor controllers (REV Sparks are cheap, though seems like Talons are the Tier 1 controllers)
Afterwards, I might start looking into getting some stock building materials that you know you will be using, whether that be plywood, sheet metal, box tubing, 80/20, assorted fasteners, etc.
From here, I would start grabbing some of the more advanced tools that I listed, such as:
Band Saw
Drill Press
Belt Sander / Bench Grinder
Welding set/station
Compressed Air station
Laser engraver
3D Printer
*Note - you could go a bit more on the "expert" end of the spectrum and replace the Drill Press with a Machining Mill.
On the very far side of the spectrum, if you're really comfortable (and have the space), utilize what Mr. Gregory suggest and buy things like:
CNC Router
Lathe
Plasma Cutter (If you extensively utilize metal)
Addition reading on the
subject.