Converting to organization


I need some help in transforming my Asana. Actually at company we have a basic version and the 10-members team. Some of members log-in by our company e-mail address and some of them (including me) use private e-mail - especially logging in by Google Account.

We want to step up to Premium version, but prior we want to convert our current workspace to an organization. Ultimately we’d like to have only 5 premium members (with company domain address) and rest of the crew and coworkers as basic members (with their google or other e-mail addresses).

What’s the problem? Members that we want to be “premium” use their google accounts for logging-in, and members that we want to be “basic” use our company domain. How can we switch our e-mail addresses to make everything running smoothly and what should we do first - changing e-mails, converting to organization, etc?

Thanks in advance for any help!