For several years I used a paper planner. Each day had two pages. One page was for the usual appointments and tasks to complete. The other was for notes I wanted to make on any subject. These could even be where I had put something for storage, or the details of a conversation. The system I was using used an indexing procedure so I could find those notes later.
The reason I made my own pages was that I write with my left hand. Most planner pages are designed for a right-handed person. The binder rings really get in the way if you are left-handed.
Step 1: Page for Notes
The left side page in my binder used dots (the period key) to make a faint line on which I could write. My pages were half of a sheet of 8.5 x 11 inch paper, or 5.5 x 8.5 inches. Holding down the period key causes the page to fill with dots very quickly. Because this page was on the left side of my binder, I left the right margin a bit larger than normal to make room for binder ring holes--about 0.70 inch. I placed two planner pages on one sheet of paper formatted for Landscape rather than Portrait.