Thanks so much, that's awesome to hear! Since the setting is designed to be customized to the table's preferences, I can't give many specifics, but I am (very slowly!) working on the full book, which will have some sample locations and mysteries for inspiration.
At the base level, the world is the American frontier in the latter half of the 19th century (so about 1850–1900), but with the addition of whatever flavors of weirdness you and your players find most interesting. Personally, I started this project with a sort of Shadowrun-esque mix of reality and fantasy in mind, where genre staples like elves, dwarves, dragons, and wizards were integrated into the world on the same level as caravans, outlaws, six-shooters, and steam trains. Throw in some mad science a la Frankenstein and Wild Wild West and you've got a lot to work with.
To start, I'd suggest asking your group what kinda stuff they'd be interested in, picking one or two of those elements to focus on for your first session, and expanding from there! The world is yours to explore and evolve.