Four times as much light as you think you need. Paint the walls and ceiling white. Beer frig, music, nice chair to sit in when thinking, and twice as much money as you think you need to spend on tools.
Quality electric drills. Both 3/8 and 1/2 and a 3/8 portable battery type. The cheep ones will wear out for sure.
Air powered rivet tool.
Big compressor, not a cheep oil less loud screaming piece of shit.
One good torque wrench 0-125 ft lbs
All the hand tools.
Heat gun
Air board (sanding tool)
Orbital sander
Big Vise, mounted on heavy steel bench.
Big table. Make from a 4X8 sheet of plywood for top.
You could also use a nice small grinder, drill press, sander, reciprocating saw, and chop saw if you like to make things yourself.
Lastly a tig welder. 225 amps AC, DC+ DC-
And if you have gone this far, a combo lathe,mill.