Work / RELOCATING TO GDYNIA, Poland - salary question [42]

Hi,
I am an Indian with 5 Years of professional IT experience (Programmer).
I've been offered a position of IT developer.
My work location is GDYNIA,Poland and Monthly would be 12000 PLN (Gross).
It would be very grateful , if somebody can help me out in knowing the Work Culture, About People, Cost of Living, Entertainment,Transportation, Average Salary in Gdynia, Poland.

And also Net Salary after Tax deduction, Taxation in Poland and How much one can save after all the expenses?

Your Valuable Information is much appreciated.