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.
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.)