That’s it and the rest can be deduced using common sense and trial and error.
This is necessary to configure Remote Login.
Remote Login is a system service while Desktop Sharing is a user service.
No, once globally configured, Remote Login works for all users.
The common RDP credentials are used to reach GDM.
Then each user should log in with their own credentials.
This makes it easier to notice what needs to be customized.
The remaining instructions can be copy-pasted as is.
Yes, unless you have more than one server.
This also makes testing easier and helps minimize human error.
That option allows to store credentials as plain text for Desktop Sharing.
It seems to apply implicitly for Remote Login.
Yes, that should work for persistent sessions.
GRD should also support persistent sessions in the next major release.