work shop

ok the wife and i are thinking of starting an import domestic car shop. dealing with engine mods, body mods, electronics (i.e. stereos, amps, wiring, ect...), detailing and possibly painting. any body have any ideas of what should i have in stock and what i shouldnt have in stock if we decide to actually go through with this idea of having our own shop. i know i will have to have i/h/e stuff but what would be good to have in the building.