@futurebird This nice online, open source book has a good overview of the general process of researching and writing a paper. Some of it won't apply in your case, but hopefully it's helpful https://pressbooks.pub/researchlifecycle/
I always find it helpful to read some articles similar to mine to get an idea of how to structure things. I think your find would work well as a research note. You can see examples of notes in the archives of The Canadian Field-Naturalist here https://www.canadianfieldnaturalist.ca/index.php/cfn/index
futurebird