Now that you have your materials, you might need to cut them to size. If you've gotten your boards from a hardware store, they will probably cut them for you for free. Once you've got 'em cut, bring 'em home- they're ready to assemble!
Once you've got your basic holes laid out, you can use a counter sink bit. This allows you to drill right over your existing hole on the back board, and drill a conical hole. The benefit of this is that the top of your screw will be flush with the board, and when you paint the final coat, you won't be able to see the screws, or at least they won't be as noticeable (see the pic below for a before countersink picture)
Drill your woodscrews through the countersink holes, through the back board and into the shelves, one by one. I like to start by partially screwing in one screw on the left side, partially screwing in the middle screw, then partially screwing in the end screw; this way I can make small adjustments and I make sure everything is equally tight across the board (haha!).
Now you should have a flat back board with two shelves attached to it!
|mollie, screw, and the red piece|