It depends on what you plan on repairing.
Tools and stuff
Never ending need for special tools.
His tools, usually.
Tools would be a good start. And a couple of Haynes manuals.
There are several companies that make custom tools for an auto mechanic. Manufacturers like CHAIN have large machines that can custom make auto mechanic tools.
The new Master Mechanic power tools have a 3 year warranty.
I believe that is Great Neck, and they are made in China now ( NOT this mechanic's choice)
Master mechanic are guaranteed for 3 months.
Micrometers
unless you're a mechanic, or know tools and alot of patience, don't try. it takes some skill, but, can be done with the right knowhow and tools. it's about a 1 to 1 1/2 hour job for a mechanic to do. you do need a couple special tools to complete.
keebler elves
yes