My objectives in starting my grandkids in journaling are two-fold: First, journaling provides them with practice in reading, writing, and drawing. Writing and drawing provide an avenue for expressing their feelings and emotions into words and pictures. Second, journals provide a safe haven for self-expression and experimentation. It's very therapeutic for all of us.
Start by collecting supplies in a central location: glue, scissors, tape, crayons, colored pencils, water colors, paint brushes, stickers, and whatever else you feel safe letting your kids use with supervision.
I gave the kids choices of paper for the cover of their journals and helped them to cover over the journals with clear contact paper. This makes the journals a little more durable. We used 50 cent composition notebooks. I stock up during the back-to-school sales.
In return for helping the kids make journals of their very own, they agree to write or draw in them once a week.
We went from books like these: