When you reorganize your basement or garage, buy yourself a number of cardboard boxes all the same size instead of scrounging various-sized used boxes. This way they will all have covers and you can stack them neatly. Mark each box with a big letter and number, like A-1, A-2, etc., on all four sides and top. Use a three-ring binder to write down the box number and its contents.
Have a time frame in mind when you buy a home, and let it guide your purchase. If you plan to start (or expand) a family in the near future, a studio is not a good idea. If you want a home in which you can age in place, or want to preserve that option, consider a ranch-style dwelling on one level, rather than a multilevel dwelling with stairs.