I am trying to make a Ragnarok map extension, I need help with the editor

I have no knowledge of the Ark Editor at all. I am looking to add a floating island with blue, green and red gems, trees, rocks, and the only creature I want to spawn on it is otters. I figured the beginning step would be to load Ragnarok, but as soon as it finishes loading the only thing there is a flat plain of water, with no terrain, or flora. It says there are about 140 load errors, some of things not being found are, “Ragnarok_Day_and_Night_Cycle”, and, “Ragnarok_Boss_Arena”. I don’t know what to do so, if someone could explain this and maybe give me a step by step guide on how to get the map to load and how to edit the map, all the way to how to publish it I would really appreciate it. Also I did wait for it to finish discovering assets. Thank you all.

Edit: In order to load the map I went to, Open Level, Mods, Ragnarok, And then I clicked open on the level titled nothing but Ragnarok.