I am trying to build a shelf in my closet but I am trying to figure out exactly what I need. I am going with 3/4" wood and I am going to make each shelf about 15" high and 15" deep. I am going to do staggered 3/4" vertical pieces as support. What kind of brackets should I use and how big should they be to provide enough support? Also, should I recess them into the wood so they are flush with the horizontal part?