I’m writing a story in Japanese for the first time. Any tips?

I'm a beginner but I just reached the last chapter of genki I, and I've been doing a good amount of reading practice with the yomu yomu and shinobi apps, so I have a decent sense of how stories are written. The story is about Sakura's first day at school so far. I could use ideas to expand the storyline as well as tips for writing in japanese in general. Thanks in advance!