What do I need to do in order to type and see text in greek fonts? also I need to see the accents and breathing marks as well.
any ideas? its probably simple but so am I.
Here is a tool one of my students built - it’s web-based, so works fine on Mac and Windows alike:
http://typegreek.com
It uses standard Beta Code for typing in the Greek, the accents, etc. That’s what I use. 
Click on “System Preferences,” then the “Language & Text” icon, then the “Input Sources” tab, scroll down and check the box for “Greek Polytonic.” At the top right of the screen next to the date and time, you should see an American flag; click it and you’ll have the option of “U.S.” and “Greek Polytonic” - this is how you switch between the two.
Hi Timotheus,
You probably already figured this out, but after you enable the Greek Polytonic keyboard as Nathan mentioned, you need to look in the same menu at the top right (where the enabled keyboards are listed) and click on Show Keyboard Viewer. This puts a mini keyboard on your screen. You can use it with any installed font that handles polytonic Greek. You can even click on the keys and have the characters appear in your word processor.
Another good option is the Tyndale kit which includes the Cardo font and keyboards for both Greek and Hebrew, and a PDF showing the keyboard layouts. You can get it here: http://www.tyndale.cam.ac.uk/index.php?page=unicode
Persequor
P.S. It’s fun to try writing messages in Greek too. You can PM me in ancient Greek if you want to practice. I’m a beginner at that, but it’s fun trying.
Or have a look at this http://www.sourcecod.com/sophokeys/