Regarding accessing the Exchange Online by using outlook Add-In

Hi there,

If I want to access the Exchange Online for specific purpose by using Outlook Add-In, is there any standard steps (Documentations) for reviewing?

1. My way is to implemented Outlook Add-In (App) and will be published into Office Store for subscription from internal users. > How to fulfill this requirement and how to publish to Office Store?
2. Or whether we could put into the SharePoint Store then installing it from here? If Yes, is there any documentations for refrence.

Thanks