I am running ZC v1.5.3 - installed a couple of modules, fixed my main template set, then installed Multi Site V1.0

The main site is showing the publisher's books only www.zumayapublishing.com - the stores are separate as the publisher wants to sell ebooks directly, as well as have a storefront for arcs for reviewers and a place for authors to purchase their discounted hard copies.

My shops don't run off root but from a folder called store. I created the config files for the 3 shops after creating sub domains for the three store fronts: store.zumayapublishing.com, arc.zumayapublishing.com, and authors.zumayapublishing.com

When I type the url for any of the three, I can see it sees the config file because I don't get an error, but the page itself is blank. (It does give me the ZC favicon on the tab so it is definitely redirecting.) I know just enough code to get in trouble, so this might be something super simple that I just don't get. (Total n00b here) I've tried going through this thread and have done a multitude of of searches, but could not find anything that seemed to fit my issue?

Figured actually posting on the thread was my next best step rather than spending more hours trying to figure this out.
Thank you in advance!