A pencil or stylus is not completely necessary, but if you want the feel of digital planning to be more like paper planning, then you will want to get a pencil or stylus. This way, you can write on the planner as you would a paper planner.
These links direct you to Amazon to view the item.
Apple Pencil 2nd Generation
Apple Pencil 1st Generation
Stylus Pen - Not Apple Brand but for iPads
Active Stylus Pen Compatible for iPad & Android
NOT NECESSARY, BUT FUN TO HAVE
2-Pack Ergonomics Grip Holder Silicone Protective Sleeve Cover
Ergonomics Grip Holder Silicone Protective Sleeve
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