Step 4: Notation
In the image below, you will see the notation I will be using. It is standard 5x5 notation, as far as I know. If just the letter is there, turn the face denoted clockwise, if you are looking at that side
' means counter clockwise.
I always solve my cube white centers first, then yellow, and the rest vary. It might help to follow how I am solving it if you start on white, then go to yellow, and work with my sides.