My dedicated shop space is about 8′ x 4′, the rest is a one car garage that needs to stay open for my wife’s car. I will sometimes set up some plywood and sawhorses in that space for assembly though. The section that is my dedicated shop has a floor made of 2″x6″ lumber stretched out over joists on top of dirt. It is an old floor filled with knot holes, cracked or broken boards (with temporary plywood screwed over them) and just generally uneven. If I cannot build a shed as my new workshop I will be looking at redoing the floor in my current space. Not sure how I would go about it though.
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.)