First Greek charter, looking for hints...
I suppose you''ve already thought about these suggestions.
I have been quite satisfied with Rod Heikell''s guides and Imray charts. I purchase them via www.imray.com. The materials are mailed from UK, and the default mailing charge of 20% arrived within about two weeks.
I also purchased a Garmin 76 CS and Garmin charts, and again have been quite satisfied.
The final suggestion is reading up a bit mooring bows- or stern-to. Rod''s guides explain how.