Dude, I'll put you in my prayers for sure, but I'll place special emphasis on praying for your children who will need them more. Trust me when I say you are so screwed for yourself. :(
This is what you can look forward to, so prepare yourself for it, brace up your courage and your determination to be a Daddy, you'll need it bad.
Firstly, they'll cast you in a bad light so they can deprive you of your children, no one in the bureaucracy gains any power over you until that is done. They'll cover it up with easy euphemisms such as "custody" instead of calling it what it is, Judicial kidnapping.
You'll be ordered to pay a large percentage of your income to the children's mother and you will not have any say about how that money is allocated or spent. Your kids could go hungry and shoeless if your ex decides to spend that money going clubbing looking for the next sucker. This will anger you more than anything, but you must maintain your composure or worse could happen.
Your rights to see and be with your children will be savagely curtailed, using the penal system to enforce the post marriage order if necessary. Be prepared to be locked up if you open your mouth at this point. The judge will be quick to charge you with contempt of court for just this reason.
I hope that you find it easier than I did to go through this process, but you are in for a very rough ride and rough handling at the hands of the child support enforcement bureaucracy.
Here's a website you might need to look at...
http://www.ancpr.org