I don't know how busy your life is but you need to allow yourself time at least once a week to go thru these papers and decide whether or not you are going to keep them or file them. I don't know how long you should keep some of them, but one thing came to mind while reading your message. If you have a printer with a scanner why not scan your papers into your computer? Then back them up with a disc? I've also found those accordian folders to be quite helpful. I even have a "heart warming "crap" file!
If you do a search of your questions on the internet you will surely learn how long you should hold on to certain items.
Good Luck!
