firstly What have you got to put in it?
where are you going to store said items
what can you hang from ceiling walls Etc
what size is it?
difficult to give advice, I’m lucky enough to have a 600 sq ft garage now I live in the country but when I lived in the city my car didn’t even fit in the lock up
security? Alarm? CCTV? Ground anchors for locking bikes?
wifi?
tv?
i built workbench then put kitchen wall cabinets above
led lighting strips are great
air compressor with dual outlet, 1 at bench other going to extending reel at door so I can check cars
plenty of electrical sockets, easier put in at start, also extending reel