Here's a good starting point, small list of a few items to do after flashing GOS.
What to Actually Do After Flashing:
https://franklinetech.com/first-24-hours-with-grapheneos/
Also look into private space, this allows you to run a "sub profile" in your main profile where you could install your already sandboxed Google play service as needed.
There are 3 main kinds of profiles:
- User (including Owner)
- Private Space
- Work profile
Each have their own apps, app data, profile data including a home directory, their own disk encryption keys and their own VPN configuration.
Private Spaces and work profiles are similar to a user but nested inside of another user for actually usage them.


