7) The MOE system is entirely compatible with any Golden Dawn tradition.
8) Not at all.
9) No, not yet. The differences between the Hermetic GD and the Druidical GD are substantial enough that you'll want to start studying Regardie's book when you've reached the Druid grade and have a basis for comparison.
Re: Celtic Golden Dawn
7) The MOE system is entirely compatible with any Golden Dawn tradition.
8) Not at all.
9) No, not yet. The differences between the Hermetic GD and the Druidical GD are substantial enough that you'll want to start studying Regardie's book when you've reached the Druid grade and have a basis for comparison.