Yep, it's the lawyers who make the most out of this sort of thing, splitting assets can often end up handing the assets to the lawyers and having nothing to split by the end.
While Antman is correct to advise getting a lawyer, I would also advise trying to resolve this without lawyers (they are expensive and charge for every 6 minutes they claim to be doing something about your case). In fact, making it very very clear you are more than willing to get a lawyer (and already have one lined up) may lead to a settlement without lawyers, which will benefit you, your ex and your kids' financial situations. If you do manage to make an agreement without lawyers get it in writing and, I'm not sure how this works, but get it somehow registered with the Family Court.
Tigerman's advice is also very good. My parents split when I was young, and they never talked to one another again. They also did talk bad about each other. As a kid this was upsetting. As an adult I thought it was just pathetic and my parents lost a fair bit of respect as a result.
DS