Suggest you start by getting a certified copy of your fathers birth certificate from the State Dept of Health in the state where born. With this in hand it will give you information on both his mother and father, usually with ages, where born etc. Then look at the 1920 and just released 1930 US Census records for the area where born. Census records are usually available at your local library or they can get copies for you. Once you get at least the birth certificate with its information, make contact with The Family History Library, part of some but not all locations of The Church of Jesus Christ of Latter-day-Saints (The Mormons). The volunteers in the library will hold you by the hand and walk you thru all the things you need to do to find your roots. They will not do the work for you. The only cost to you for their service is the cost of photo copies, usually $.05 ea and about $4.00 for postage from and back to Salt Lake City, UT for each microfilm that you might need to continue your research.The church has records from around the world to assist in research. Good luck with your search for your roots.