I am not the most accurate in applying GTD but this is what you might do:
In this instance where you have a large amount to process, you might consider making your active project list before you process. You probably know what your projects are anyway, but maybe not defined them. Locate any exisiting folders for the materials that support these projects. Or label the foldersbefore you start processing. If your Active Project list is beyond managable before you start, pare it down to what you will work on this week.
If the item is not trash or not something to return to another person and it does not refer to an active project, it just gets filed without a n/a being noted because it is just for reference.
No next action needed.
If it refers to a Someday Maybe project, make sure you have the project loosely noted on the SDMB list. No need to tighten up the definition at this poin. Also, don't make a list of SDMB next actions but do make reference lists and reference folders. Example, if you find clippings about books and CDs you might want, you can put them in one folder, and make SDMB "Create List of Books and Music to get from Library or Bookstore." I made the mistkae of tyring to make the list as I was processing. I don't need to tell you how much of my processing time this used up.
If filing is bogging you done, you can use an A to Z sorter, just write in the file head in the upper right hand corner. I have one of these for general and professional, and one of these for stuff pertaining to remodeling my house.
If you find that the 2-minute tasks are great in number or varied or taking more time than you have right now, you can collect these in one folder, and make a project something like "Odds and Ends of desk work are dealt with by Friday, put it on calendar and make the n/a @desk:work on odds and ends for 30 minutes before Friday. Do only the ones immediatly that a consequence that concerns you.