[Decemberist80]

Here's a brief synopsis of where I am stuck at ... I am seeking any input available at this time:

I have pictures from my foster mother in which my birth last name is written on the back. I know that my mother was 17 at that time and had a younger brother and sister. I reside in NJ where it's next to impossible to get info. I am considering sending letters to people with the last name I was born with in the counties around the hospital I was born in hopes of finding some relatives (especially since it's not a very common last name).

Please give some advice on what I should write in the letter. I am cynical by nature and am fully aware that I don't want to divulge too much information in the initial letter.