To share your channel you can use flux.video/[name of your channel] or if you have an Enterprise version you can configure your custom domain name.
If you are not live, your channel will show a landing page with the date of the next upcoming event. Visitors of this landing page can subscribe to your channel using their Name and Phone number.
Once they have subscribed you can send them an SMS message. This is useful to inform them when you are about to go live.
Shortly before you go live, you can post your channel to social media platforms, send out an email or SMS to get your viewers coming.