You can add HTML manually (e.g. <em>Italic</em>) to the tour description text and the postscript text, but not the title.
There is no built in way to reorder the tours or items. Regading separating the items by type, the theme is designed with the expectation that all items will use the Curatescape Story item type.
The theme is designed with the expectation that all items will use the Curatescape Story item type, be more narrative than archival in nature, and that they will all be placed on the map.
Story is just a label used for items on the frontend of the site. You can customize that label in theme settings.
Photos for stories/items are added like any other Omeka site, i.e. using the Files tab in the admin item form. With the Curatescape theme, the first file is used in the header (and in other areas such as the map and browse pages) to represent the item. After adding files, you can edit the file metadata to create captions, etc.
Also, I noticed that your homepage is using a static Simple Page. If you want to use the theme’s default homepage design, you can change that up in your navigation settings. The homepage is fairly customizable so you might want to look over all the theme options to get a setup that works best for your project.
That could be. If your items don’t have a particularly strong tie to geographical place, or if they’re not primarily narrative-based, Curatescape might not be your best option. Sometimes a standard Omeka theme using the Exhibit Builder and/or Neatline plugins might be a better fit. Curatescape is really designed for a pretty specific use case.