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Sorry i dnt have Greek characters, so i ll answer as that
My friend if you read all that subject you ll find your answers!
But in your case it ll take i think about 1 year total time to get the cirtificate.
You need 6 months work onboard and 3 months school ...plus little time so thats all.
Salary for newbies is about 3300$ monthly (3rd assistant electrician) or less
and is better to start your carreer in cruise ships ....more easy 4you coz you ll have assistance from other countries partners.
So good luck !! (i m onboard now cruise ship working as 1st electricial in hotel operations)