This will likely be the first opportunity to examine the house without furniture, giving you a clear view of everything. Check the walls and ceilings carefully, as well as any work the seller agreed to do in response to the inspection. Any problems discovered previously that you find uncorrected should be brought up prior to closing. It is the seller's responsibility to fix them.
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.