1.) You need to pick a shelving system of some kind. One that is sturdy and can hold boxes on the top shelf to maximize vertical space.
2.) Pick matching containers. I say go simple with these, you want to be able to add more as time goes on.
3.) Take everything out of that area and clean.
4.) Sort, sort, sort! Take everything out to the driveway, sort "like" things together and put them in the proper size container.
5.) Put everything back on the shelves with a label.
6.) Sit back and take a look at your newly organized garage with style!