There is no documentation on how to create Wikidata Tours
I've started a draft here https://www.wikidata.org/wiki/User:John_Cummings/How_to_create_Wikidata_tours#4._Add_your_new_tour_to_the_page_about_tours
Here is a rough description of how to create Wikidata Tours, turn this into a page of instructions https://www.wikidata.org/w/index.php?title=Wikidata:Project_chat&oldid=1095277967#Is_there_documentation_for_how_to_create_Wikidata_Tours?
Finished product https://www.wikidata.org/wiki/Wikidata:How_to_create_Wikidata_Tours