From the Store Dashboard, you can click the "Share" button that resides below the particular store's row in the My Stores area. From there, a modal will appear and you'll see the link/URL to the store's page listed. Click the "Copy Link" button to copy it to your clipboard.
From here, you can now share this link anywhere you want - your store website, an email newsletter, a Facebook page, Twitter, Instagram and more. Next step - announce that your store is on League of Comic Geeks and invite customers to connect and share their pull lists.