This would include the birth certificate, court of jurisdiction, hospital of birth, agencies, dates, times, attorneys, birth names, non-identifying information, etc. Early in your search, write a letter to the person you re searching for, as well as a brief autobiography to give to them. This can help you sort out your own motives for searching and expectations for the reunion. Begin to gather some photos of yourself at various ages. You can use a color photocopier instead of having reprints made.
Photos are a welcome gift once contact has been made.
They help bring reality to the situation, and put a face on previously impersonal data.