How do I get my recalcitrant ex-wife to allow me to see my son? Can anyone introduce me to a family lawyer?

Some years ago, I broke the law and was incarcerated (not drugs, ual or violence related). I have served my time, and currently work full time in a managerial position. I have the support of my loving parents and siblings. My nephews and niece adores me, and I adores them. Although they are about my son's age, it's still do not relieve the emptiness in my heart for how much I misses my son. I have tried various intermediaries to contact with my ex-wife, to see my son, but she completely ignores them. My next stage is to use the service of a family lawyer in Melbourne. Can anyone out there please advise me on how best to deal with this situation??