You can find all the parameters for Google Workspace email hosting by navigating to this page.
Information about sending, group messages, drive limits and information about trial accounts can be found in the official article from Google.
What is a trial account in the Google Workspace?
Trial account means that you will have reduced limits for messages and unique recipients per day, you can find exact values in the limits page. If you wish to know how to increase your limits - be sure to contact our Customer Success team and we will help you out 😊