Confused about what do after emptying the "in" basket
I am going through the GTD book and was able to empty my "in" basket, adding the next actions to all the documents and objects I found that needed to be worked on. I have read the next section "Workflow Diagram - organizing" but I have no idea what I need to do next. He mentions 7 basic categories, but I am not clear how to convert those into projects? or lists?. Very confused.
Could someone explain to me what to do physically with the pack of things with next actions attached to them that I have in my desk? I bough the folders he suggested and the labels, but I don't know when I need to use them or for what.
I appreciate the help,