Plywood and long stock can also be a challenge to store in a shop. When I had an 8' bank of cabinets in my shop, I used to slide my sheet goods in behind it. Now that they are gone, I just stand them up against the wall and use a wedge system to keep them neat and upright. Long, narrow material goes on my lumber rack beside my table saw. I also store dry lumber standing on end in one corner of my bench room.
Lumber and supplies are moved in and out of the shop through the front overhead door. To the left of the door are the lumber and plywood storage racks. Across from the lumber rack and to the right of the overhead door is the radial arm saw, miter saw and mortise utilizing a single fence system for all operations. Below and above these are cabinets and storage for misc. power hand tools. Next to the radial arm saw and in the corner is the floor drill press with accessory storage next to it for all drilling operations. Across from the radial arm saw is a separate workstation set up with a small portable table saw and router set-up with storage underneath for routers, bits and accessories.
You can also use Google image search to research a project. Unlike the PDF search, the image search provides a photo of what the project will look like, which is helpful in determining if you want to pursue building it. By doing an image search for how to build a step stool, you will have a ton of options that all lead to woodworking plans of various quality. (The how to part of these is important—otherwise you’ll just get pictures of step stools.)