Empty the garage. Separate items into three piles: items to keep, items to throw away and items to give away. Toss throw-away items into a trash bin. Donate the give-away items to a charitable organization.
Separate your "keep" piles into various plastic bins in coordinating groups. For instance, keep seasonal decorations together in one bin and old photographs and keepsakes in another.
Install polyvinyl garage flooring over existing concrete. You can roll out polyvinyl flooring by hand and it does not require adhesives.
Replace old garage doors. If your garage door has seen better days, a new one can do wonders for the look of your home as well as the insulation. If you plan to spend time in the garage, install a door with windows to allow for natural light.
Install shelves. Using screws and an electric drill, attach steel brackets to the wall at even intervals. Use a level and tape measure to ensure brackets are hung evenly. Add wooden shelves to the brackets.