I want to change my son's last name into mine.

You'll need to do a change-of-name proceeding. Instructions are here: http://www.courts.state.ny.us/forms/namechange.shtml.

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How can i get court order to get access to ex husbands mental health records?

You'd need to provide info as to what kind of case you have pending & how you believe the records are relevant. If you do not have a pending...

How do i request a new Law Guardian for my son?

You can file a motion to have the law guardian removed. That said, such motions rarely succeed. Principally, the Law Guardian, while s/he should...

Child support court order was done in NY. my 18 old now lives in PA do I go by NY or PA laws?

If either parent still resides in NY, then child support continues until age 21 under NY law.

The form is here: http://www.nycourts.gov/divorce/forms.shtml#Statewide. You'll need to have it notarized.

Is the common law for couples not married still apply in Brooklyn, New York and in Charlotte, NC.?

NY does not recognize common-law marriages. If you were married in NC, and one of you still resides in NC, then you may explore getting divorced...

I want to sign my rights off since I cant see my daughter

You can do so only in conjunction with an adoption case. Otherwise the surrender will not be valid. Speak to a Child Custody attorney in your area.

Boys father never sees them i have sole legal physical custody of my boys. my finacee wants to adopt them

You would seem to have good grounds for an adoption. Either the biological father can sign a surrender, or you can have his rights terminated by...

How can I get a divorce paper on my husband

If your question is: how do I start a divorce case - then the answer is to file a summons & complaint with the court. Instructions & forms are...

Can I get full custody while I'm married?

I agree with Ms Fiss - one cannot generally file for custody while still residing with the other parent. The exception is if you are imminently...