Advice and support needed.

I am 21 years old and just found information about my closed adoption. Up until last week, I believed my adoptive parents didn't want me to know anything about it. I remember asking a few years back, and they wouldn't tell me. Well, recently my mother dropped information about my adoption in a ordinary conversation. This threw me off quite a bit. She mentioned that my mother was young when she had me, and that my father just left once she found that she was pregnant. My adoptive mother also mentioned that they used to have physical records in the house but were lost in Katrina. My dad also requested that the lawyer who proceeded over the adoption hold on to the physical records as well, as a friendly request. I guess my first question is, how should I go about recovering those records again? Do I have to go through another lawyer, or should I try and get in contact with the same lawyer from 21 years ago? Secondly, if I were to find my biological mother's name, how should I go about contacting her? All these different scenarios keep playing out in my mind. Is she married with a new family? Should I interact with her if she does have a family? I don't want to ruin anyone's happy life, but at the same time I've been living a lonely life and could use some answers. I apologize for the long post, and I thank anyone for giving me aid in advance.