In addition, a finding of irretrievable breakdown must be supported by evidence that either a) the parties have lived separate and apart for a period of not less than 180 days immediately preceding the date of service of the divorce petition; OR b) there is “serious marital discord adversely affecting the attitude of one or both of the parties toward the marriage.” 
The next step will be to assess where you and your spouse agree and where you need some work to get to agreement. Once you have a sense of what needs to be accomplished, you, your spouse, and the mediator will plan how you're going to accomplish it. It's very likely that you will need to gather more information, especially if you're dealing with property issues as well as child custody questions. (For example, if you don't know the value of your house, you can't have an intelligent discussion about a buyout.) The mediator will help you figure out what information you need and ask each of you to commit to bringing certain things for the next session.
Most courts give parents the opportunity to work with independent evaluators soon after the case is filed to see if they can reach an agreement about custody, parenting time, money and property. The two types of ENE are: Financial ENE (FENE) to settle financial disputes and Social ENE (SENE) to settle custody and parenting time issues involving their children.