If you can reach and agreement about the kids living with you and he sees them under supervision then you can enter a consent agreement and have the court make the orders.
If you cannot agree you first have to go to mediation and then if that fails then go to court.
You should contact your closest family relationship centre. This is a free service provided by the Federal Government. Their website is
You can find your closest one on there.
The web-site also have alot of useful information and links to assist you.
Before going to court you must obtain a certificate from a family dispute resolution practitioner. You get this through the free service provided at the family relationship centres.
If you need to go to court then you will need to file an application in the Family Court or the Federal Circuit Court
http://www.familycourt.gov.au and http://www.federalcircuitcourt.gov.au
If you stop him seeing them, he can take you to court and get a recovery order and the court will not look fondly ***** ***** for that.
If you fear for their safety because of his drinking you have to raise this with the court and orders requested that he not drink before seeing them.