For your journey1 you will need three notebooks2. It does not matter if you use physical notebooks or digital ones, or a mix. The most important thing is to use them. The notebooks are not a matter for assessment or evaluation. If you do them well, they will be a sound basis for all of the writing that you do along the way. They will help you with your writing.

Notes need not be just text. Raffaelina Rossetti has a useful collection of sketchnote videos. The notion of a sketchnote derives from Mike Rhode's book3.

And, if interested in the history of Apple, Regis McKenna's notebooks are a good illustration of the purpose they can serve over time.