You, (yes, YOU) and everyone else who wants to chime in are going to assemble a theoretical garage with the tools you feel are ABSOLUTELY ESSENTIAL to any starting garage. We're not looking at CNC mills, etc. The idea is to enable the broadest capability for the least money. Let's assume we have a floor drain and a 220v capability just to get that out of the way. You can suggest support devices (e.g. circulation fans and lighting) but it's probably not worth it for the purposes of the thread.
I'll start with:
Solid work bench
Solid bench vise
Set of SAE and Metric wrenches plus sockets
Hacksaw plus blades
Hand files (your suggestions for type/brand and quantity)
Wire Brushes (type?)
Hammers (type and size)
Battery charger
Electric drill (cord or cordless?)
Angle Grinder/s (suggested brands/sizes?)
Measuring devices (tape or straightedge? Both?)
Tin snips (quantity and type?)
1st Aid kit
Fire extinguisher
Bench Grinder
Clamps (type, quantity and size?)
Drill press (does this meet the absolutely essential criteria?)
Welder (does this meet the absolutely essential criteria?)
Welding table and essential hand tools for welding?
Once we're done with this one let's go on to the second level of stuff that's really nice to have (band saws, etc.)
Go