looking for birth mom/family

i am starting to look into trying to find birth family. i was born august 14 1970 in seatle washington,at virginia mason hospital and was adopted through luthern family and child services the adoption was finalized in aberdeen washington i dont know much my mom said my birth mom was 15 or 16 and so was birth father i have one daughter and would like to find what i feel is missing and for medical questions., i have lots of unanswered questions can anyone help or give me ideas on where i can start please