You will therefore come up with two years that you will use in your search. Note these years of birth in your journal. Then figure out how old they are today and note that in your journal. You should also get their general description which will include height, weight, etc. There should be information concerning their education and possibly something on their occupation.
Unusual occupations are wonderful pieces of information.
Also if it is an occupation where someone would most likely belong to a union or have some other type of affiliation that is great. These are the kinds of tidbits that can lead to finding them. Look at the information about your birth grandparents. This can be extremely important after you get a last name to search for. Since there is very good chance that your birth mother's name has changed you will find yourself looking for her parents, brothers, etc.