Creating a scrapbook is a great way to preserve memories and adding journaling is an important part of the process as it tells the story to future generations.
There are numerous ways that you can add journaling
Storytelling:
Your journaling can be in a storytelling form, recounting the details of the photos in a narrative form.
Descriptive:
You can simply write what the photo is about covering the who, what, where, when and why.
Poem:
You could be different and write a little poem as your journaling.
Bullet Points:
If writing long paragraphs or poems is not for you then you can just add your journaling by way of bullet points with a little or as much detail as you like.
Whichever way you choose to add your journaling the most important thing is that the details are there to enable those who look through your albums to be able to know who and what your album is about.