Great question. The Shopify plan is a monthly subscription that will charge you every 30 days regardless of whether a sale has been processed. The subscription costs are to ensure your site remains online and accessible while also offering you a variety of tools and services to help manage your store.
Have you started selling and are seeing a dip in your sales? If yes, let me know as I'd be happy to explore the marketing tactics you've already tried, and provide insight into what other options you may have to help drive traffic to your store.
That depends! If you're looking for a full email client, then you would need to use services such as Zoho or Gsuite as we do not currently provide a full email service natively. However, we do offer email forwarding, which allows you to create an email with your custom domain, which would forward any emails sent to that email to an email of your choice. Replies to those emails would showcase the email it was delivered to, and not the email with your business name. Email forwarding is only available to domains purchased through or transferred to Shopify.
There should be emails set up by default; however, you can edit, add or delete these emails by going to Online Store/Domains, then clicking on your domain. We also have a handy help doc here that dives into the steps needed to get email forwarding set up.