Even if you use a computer to organise your family tree, you are still likely to end up with a lot of physical documents that you need to keep in order. There are a number of ways of doing this, the most obvious being alphabetically, but this can become confusing as your research grows, especially if you have multiple people with the same name. Another way is to use numbers from a pedigree chart of your direct ancestors.
Organising your family history files
Solihull Life 