You should definitely read through this thread, despite its great length, because it is the source of delve information. It has example teams, screenshots, example clips, and a lot of theory-crafting discussions.
Plus, it revives itself every time there’s a new faction, so finding the section regarding The Warrens should be pretty simple (though, again, l’d read the whole thing, especially because some of the info regarding best Hoard-leveling practices happened early in the thread):