Hi Rich,
Have a wee look through older posts, you will find out it's not so easy to get work or land to build on, and no english speaking school.
I have worked there with a Uk tour operator and have friends there both Greek & English.......you will never earn a great deal, as most jobs are seasonal !
Don't get me wrong, I love the place and have contacts, but I could never afford to live there permenantly ! and I would love to !
The main guy to talk to about building a house is Yiannis Bracco, he has a 'site' using his surname and he is not a cowboy...there are strict building conditions due to the earth tremors, so it won't be cheap !
Have a browse through the older posts, there really is lots of info on this site.
Good Luck