Life / Getting a second hand car and driving licence in Wroclaw [4]

Dear Members,

Greetings.

I am from India and moving shortly to Wroclaw for an 2 year assignment.
I would like to buy a second hand car ( ~ 1200 cc, any brand , ~3 to 5 years old) for my local transport.

Can any one give a hint how much does it cost to own?
If I get a Intenational Driving licence from India, does it require to get a driving licence once again from Poland

Have a great day