Work / What is deducted from a salary in Poland apart from Income tax? [155]

Dear friends - I have been offered a job with a monthly gross income of 15000PLN. I have a wife and a 4 year old son. I have been asked to move to Krakow to work in a large international bank. My son will start his schooling soon. Can you please share the following:

a. How much will be my net income monthly? My wife will not work
b. Is this income enough for a family of three?
Your thoughts and views are highly appreciate at this moment.