It's not difficult, Richy, just do a list of the various generic stuff you want and number each file with the title:
1. Red van documentation
2. Blue van documentation
3. Personnel record for Bob Jones
4. Personnel record for Mike Richards
5. Kinky sex toy catalogues
6. Etc
Print the list out, create the files, put them in numerical order in a filing cabinet.
At a later date, if you wish to insert a file between 2 and 3, call it 2a or something.
Stick the file list on the filing cabinet.