Ok, you've got the file system going, how are you going to find something in it? If you did your job properly, the first thing that pops into your mind on a topic will be in your alphabetical file index. Remember life insurance? Later on if you want to review your assets all you have to do is look under "L", "I" or "B". Maybe you thought of it under "A" for assets this time. Add that to your index now after you've found it under one of the other letters. You can add to and repair your index any time you want to! As you use this filing system, you'll discover it makes no difference whatsoever in what order you enter things in your file! No fooling around trying to decide what category to file something under. No accidental duplication of files.
We receive information constantly in no order. It comes to us from many sources at once, the mail, company mail, at meetings, from friends, magazines, TV shows, trade shows, etc. In the past we had a devil of a time deciding what to do with it. Be honest now! Don't you have a box or a pile somewhere of information you just couldn't decide what to do with? You probably don't want to throw it out because the contents may be of use in the future. Now you can file it so it'll be of use to you!
Once you have all you info in a numbered file system, if you want to make it a little more secure. keep the index in a different location when you're not around. The bigger your file system the more frustrating it will be for unauthorized people to find stuff in it.