A drill with a bit that will put holes in the back for cables. Probably 1-2 inch drill bit. Go to any home improvement store for the bit. You might need a small drill bit and clips to hold the shelves if you need to change the position of the shelves. Make sure that you don't drill all the way through the sides if you have to do that. Also, any home improvement store might have the clips. If there are shelves in it already, take one of the clips out to the store with you and they should be able to help. Also, try to go to www.diynetwork.com or something like that and www.hgtv.com. Hope it helps.

Site below shows how. I made one too and later had to add a light in the top. Also hgtv.com or DIY.com