Sounds like you need some important and fundamental information. The Shopify email app is NOT an email account. It’s a marketing tool to send emails from your email through Shopify’s server to the customer.
You want info and johndoe, you need to set those up with your email provider. Which provider you choose, that’s up to you. Best practice is to bundle with domain. So the email is info@YourDomain.com and that service is where your marketing emails will be from. Lots of companies. GoDaddy being the biggest.