License/Infra Requirements for Mesh Skills building

Hello, I am a freelance Unity developer working on building my Microsoft Mesh skills so that I may eventually assist my clients with building and deploying Mesh Applications. Since I do not have access to an existing Teams organization, what steps/infra/Licenses do I need to acquire/register/setup in order to work through the entire work flow of building a Mesh application and deploying it on Teams?
I have started reading through - https://learn.microsoft.com/en-us/mesh/setup/content/preparing-your-organization while I have a long history in IT not much of it was spent administering Microsoft environments.

I see there is a Teams Premium trial for 30 days (25 seats) . If I register for that will I require anything else? When that expires is there a minimum number of Teams seats that need to paid for each month to continue?

I already have setup and have been reviewing the Mesh Toolkit.

Anything else required from Azure services?

Glenn