What should I say to my father for the first time, we have never met or talked before?

[em]

Talk to your mom about him first! find out as much as you can. There might be a reason why she wanted nothing to do with him in the first place. That's amazing that your mother raised you on her own. She seems like a spectacular woman. He definitely knows that he's your father and its perfectly natural to have the feeling of wanting to get to know him. Usually when a man just leaves a pregnant women on her own and is perfectly fine with it, it seems a little odd. Just be careful before you make any rash decisions. Best of luck.