A tutorial on how to do this can be found here https://youtu.be/mM3Gh63za2Y
For the dividers you will need Dsp measuring 8 1/4 × 11 3/4" scoreline at 2 7/8"
For the inserts you need a piece of A4 paper cut to 8" in width an scored at 2 7/8"
I have used the It's Snome Time collection by Craft Consortium throughout this planner, and you can order it here https://www.craftconsortium.com/
I hope you have enjoyed following the creation of this planner and give it a go yourself.
Tomorrow is the last day of my xmas in July mini series and I have a lovely stamping technique for you!