Hi Pavlos, you need to look up
www.sailingholidays.co.uk. Not cheap, but because this company own all there own boats you don't need any experience. Southern Ionian is very clam and if you have never sailed before or used a boat then for £90.00 for a day you can have someone give you a crash course. When we went another couple they had someone for 1 day had never sailed before, but won the competition for the best sailors for the week Its line of site sailing you don't really need charts or navigation skills. There really easy to sail, I do it virtually single handed with the OH sunbathing. A different port everyday. Sailed in to the sailing Club at Corfu Fort this last time, really very nice.
Neil