You havn't said why you want to move to Crete. If it is to improve your career prospects and earn mega bucks just forget it, as Andy said, it ain't going to happen.
The vast majority of Cretan businesses are small, family affairs. The concept of marketing, as you understand it, does not exist here. The few, reasonably large businesses that do exist, and maybe could use your skills, are usually offshoots from mainland based companies. Your expertise has a value in Athens, but not here.
As Lynn said, year round work is extreemly difficult for a non Greek to get. A summer job in the tourist trade, working seven days a week for less than the UK minimum wage, and the winter spent picking olives at five euros an hour is about as good as it gets. To my mind, the only worthwile occupation which has any hope of giving a reasonable income and lifestyle, is to start your own business. In the UK 80% of new businesses fail in the first two years, I guess that it is even higher here!
I have said before, and been lambasted for saying it, but you must be mad to want to work here. The weather is too hot, the hours are too long and the pay is not worth getting out of bed for! Crete is a wonderfull place to retire to, but work, you must be mad!
You may not have liked what Andy said, but take note of it, he told the truth.