Step 2a.) If you went to IKEA in step 1.), buy shelves and shelving frame or frames (Multiply qty shelves and shelving frames by amount of completed shelving systems you wish to make) then go back to step 1.)
Step 2b.) If you went to Harbor Freight in step 1.), buy storage bins (Multiply qty storage bins by amount of completed shelving systems you wish to make, 2 medium bins count as one large bin if you modify the build) then go back to step 1.)
Step 2c.) If you went to the humane society find one or more cats to adopt, you must have at least 2 for this project (no matter how high the quantity of shelving units you want to make, just be aware that cat scans will become slower as the shelving quantity increases) and if you already had the necessary cats, or have procured them, go back to step 1.)
I'm not writing out all that again here!