he was born in Poland in 1914
First of all, make sure to base your research on facts. Your father was not born in Poland, because such a country didn't exist in 1914. Having said this, depending on which country and city he was born in, you could start to contact the local civil registration offices and archives of that area and ask for birth and marriage certificates of your father. Churchbooks help for data pre-dating the early 1870's - try the LDS or any other online database. Once you've found the marriage/ birth certificates (which list details about your father's parents), you can go back one generation and research your grandparents. And so on and so forth. Be prepared to spend decades for your genealogical quest - it's addictive once you've started... :)