I believe I have answered most of your question in this reply here → Replicating Shotgrid pipeline concepts in Ayon - #9 by Innders
To add new access groups you can go to the Permissions tab in Studio Settings
And then remember to assign the access group to yourself (or another user) on the projects you want to see in Users settings. There’s more details in the linked post above.
If this solves your issue please mark as resolved 