Use your common sense. Be nice to your bartender and waitress. They will make sure you have a good time. Ask them lots of questions, most of them are locals. Pick up a book with common phrases.
Most places have maps and information.
Grab some and have some fun. May, June, September, October are probably the best months to go. You'll miss the summer scorching heat. You can get your own cell phone to use while in Greece. They do have phone cards you can buy there, sometimes they work, sometimes they don't.