What is the most logical next event?

How to establish an office filing system
Decide on a filing system.
Whatever it is, it must make sense, so you'll know exactly where every piece of paper is. Your options are :
Alphabetical.

Choose your answer from:
[a]. Filing system can involve numbering the documents in chronological order. This can be advantageous if you don't want to file in your own office at all, but it might help if you have friends or family who share more common areas of the office that clutter up your space.
[b]. List all files that are closest to you on a single sheet of paper. Include files on the same sheet that you and others can identify easily.
[c]. This system is best when most of your files are going to be names of clients, patients or customers. Subject or category: most file systems are organized by subject or category, which works well when set up correctly, but can also be the most confusing when it's not.
[d]. This will be the most basic filing system for the office. It is often set up like a spreadsheet and is easy to use, depending on your situation.
[c].