Looking for BirthMom has been 42 Years

Was adopted at 9 months old from costa rica from us citizen parents and Have lived a wonderfull life with my husband of 22 years and now I wish to find my birthmother .I have small amount of info but if anyone can give some advice on the best way to start we would greatly appreciate it.I have lived in the US since adopted.I hope to find Birth mother and travel to see if possible.Parents adopted me from catholic orphanage in costa Rica , Only shows birth moms name , who and how do I contact to start searching for her if possible.I can pretty much understand why I was put up for adoption being the time and the place , I would like to make her life better now if at all possible , it has been a long time . I also may have other siblings still living abroad or in the U.S . ?