I am 37 and I am trying to find my biological father, all I have is a name. What do I do?
I was legally adopted when I was 12 with no rejection

Try to find a detective agency or try getting on that program that helps people find their families, they show it on TV but I can't remember the name of the show.

First where, Canada, England, US, we are International site?

Next is it a common or unusual name, the more unusual the easier to perhaps do online people searches from some of the pay people search sites.

Beyond that hiring a PI firm