an epoxy coated floor and great lighting are a huge advantage to getting the shop looking clean and bright, and a clean bright shop makes things easier to work on, but don,t let JUST a shops appearance alone be your only indication of the quality of work that gets done,the MECHANICS SKILLS DO COME INTO PLAY HERE AS WELL AS THE SHOPS APPEARANCE, if its a dumpster you can be reasonably sure you don,t want work done there, but if you can eat off the floor and shelfs Id doubt theres much actual work going on either. and shop tools like welders,grinders,drill presses, and jobs like engine assembly and radiator repairs, and tune ups generally leave some indication that work was done recently!
keep in mind guys generally do the best they can,and are proud of thier shops, but thier budget may not allow some of the nicer touches, like tile, or cabinetry.
what you need
as much floor space as possiable,that can be securely locked up
decent tool storage
a flat dry floor
protection from weather
as many quality tools as you can buy, beg, or borrow
decent referance materials and safety equipment
hopefully a lift
good lighting
almost everything else is optional