How to find my biological father?

My father was a sperm donor and my mom was single when I was born so neither of us know much of anything about him. the "dad" I grew up with disappeared when I was 11 along with 10k+ dollars so I really lost the only father I have ever had. I just think it would be very interesting to meet him and maybe give me a chance to have a father-daughter relationship, what do I do to find him and be able to meet him?