How do we find Biological Son, his initital are MC

Hello, Born in 89. His initials are MC. In 1990, I was forced to sign my rights away on my son. The birthmother made it extremely difficult for visits and my sons emotional state was seriously being affected and was seriously altered. His mother promised that I would see him if I would just sign the papers. His mothers intials are CYC. They disappeared for a number of years and everytime we thought we found him, they would disapprear again. My wife and I think that we have found them and they are not too far away. He will now be 18 in the spring of this year and I want to contact him. His mother will do anything in her power to keep me away, she has been very vendictive in the past and I have tried contact last year, but we unable to speak with my son. I have since tried to find her in the directory and I am afraid she may have moved away again. This is killing me inside, I want to tell my son that I am alive and I love him. Help me.. How do I get in touch with him. I think of him everyday and I have been denied so much of his life. I pray everday that he doesnt hurt for me. But I also pray that he starts his seach for me. What if he doesnt even know that I exist or if I am alive? What if she has told him that I was dead? I need help. Please... If you know of anything that I can do to find him, please let me know. I think that I have the state penpointed. If I am correct, my son will be attending a certain high school and will graduate this year. The state he may be in is just one state from me. My mother and father are heart broken and cry all the time for him. My mother has letters waiting for him to read and my wife emails herself letters for him. In hopes that one day, we will see him again. We had a family meeting last night and we thought of trying to get a school annual to see if his photo was in it. We cant get the album, they wont allow anyone but students to make purchases on their year books. We thought about getting a birth certificate, but it has been altered. He may hate me when I do find him. I know that he has been told many lies. I never wanted to give my rights away and wished that I had not been so ignorant when I was younger. If I could take back that day, I would in a heart beat. I dont know why I trusted her. She even had him call me right before this event took place and he told me that he wanted to be adopted by her new husband and he wanted to change his name. It broke my heart. I know that this wasnt him speaking, but it still hurt. Sometimes you have to put self asside and do what is right for your child. That is what I thought I was doing at the time. If I had not signed my rights away, I could have pushed my way in. But, I did, so I have to use caution. But soon, he will be 18! I have all the right to contact him now dont I? My wife and I just found this site not too long ago, the reason we found it is because it was referred to us as we stepped into adoption ourselves. We are so very happy to have found this site, it didnt occur to my wife that we could get help or direction in finding my son on this very site until last night. Maybe I should never contact him, but I have to take the chance. I have to if only to say, I have always loved you son. If you have any ideals or know the best possible way I can approach him and this situation, please help. If they havent moved yet, how can I tell him that i am his father and I love him. I cant jsut pick up the phone and call, his mother might jump and move again. How can I tell him all this without hurting or throwing him into shock. Thank you,