I would start with this tutorial: https://forum.inaturalist.org/t/how-to-make-a-project-for-a-specific-place/41066, which links to https://forum.inaturalist.org/t/how-to-draw-a-new-place-in-google-mymaps-for-uploading-to-inaturalist/41063. Together those should get you going, let us know if you still have questions.
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