Roo,
You don't need to talk to them that much on the phone. If you know the are a divorce lawyer, then call for a consult. Go in and speak with them. You will learn more than they do, trust me.
They don't need your life's story. They need to hear that you're divorcing, if you have children who are minors (due to needing a child custody agreement), and if you have property and money to split. They may ask specific questions about the ending of the relationship if it matters in your state. Where I live (in Illinois), none of that matters - it's a "no fault" state. We split things 50/50. There are usually percentages put into place for the parent paying child support (to the "residential" parent - the one whom the kids live with). It's a certain percentage of their pay. It won't matter if they cheated or if you did. There are typical ways to do things that you build off of (like visitation - typically every-other-weekend). Other things are more specific to you and your situation - joint property, inheritances, loans, etc. Generally speaking, going in for a consult will give you a LOT of the information to feel better about moving forward. Once you realize that the entire thing is not a complete crap shoot, you'll begin to see your own future more clearly. And then you can start making plans and moving forward one step at a time.
Best -
Kel