I have a legel document drawn up by an attorney. My ex is not honoring this. How do I go about enforcing it?

there are formal and informal ways of trying to enforce a legal document.  for example, you could ask the attorney who drew it up to write a letter on your behalf, requesting that your ex comply and telling your ex that if he does not, then a lawsuit will be filed.  or you could simply file an action in the correct court to enforce the document.   there may be other enforcement methods also available. without knowing what kind of a document it is, i can't give you a more specific answer.