Re: Trying to understand structures and table of contents
akantro, you can also try (besides the suggestion by Rick), to play with the options under "Admin > Wiki" (soe of those tabs) where it says: "open page as structure" or any other option related to structures.
Definitively this should be clearly explained in the documentation, so I encourage you to add to the Documentation (wherever you think it's the best place) your trick to make it work.
For sure, you could force that page to be loaded as within the structure by adding the required parameters to the url to be loaded as homepaage (see link pointed by Rick)
HTH