AO and NORM BAKING

Does anyone know of a good tutorial that describes the workflow of baking ao and norm maps then applying them all together correctly. Sometimes I get the ao good and then other times when I bake the ao, all I get is black. Could someone please explain the proper steps to take to get a finished baked texture. Thank you

From what I understand, you bake ao and mix it with your baked texture, but the normal map is an entirely different imageā€¦