I used this guide to build myself a storage rack. Modified some of the specs to match my dimensions, but it turned out really well and sturdy. I stained it with red oak and then sanded and used semi gloss water based poly. bought 2x4s and used free scrap plywood from Home Depot
https://1withabullet.wordpress.com/...o-can-rack-a-k-a-the-overbuilt-shelf-project/
https://1withabullet.wordpress.com/...o-can-rack-a-k-a-the-overbuilt-shelf-project/