Clarify and compare. This is a great way to get to know the mediator and become familiar with the process. Not everyone offers it, but you should ask. Sometimes mediators offer the consultation free if the couple continues with the process and charge a minimal fee if they don't. They might include a brochure, specific information on the mediator, overview of divorce in your state, child support guidelines, issues to be covered in divorce mediation, relevant articles.
Materials are a reflection of mediators.
If you have the sense the materials are slap-dash, so might the process be. If on the other hand, the materials are instructive, relevant and well put together, it's more likely the mediator's process also will be. Good mediators recommend that attorneys for both parties review the agreement, a Memorandum of Understanding, before it is signed. This assures you protection from any legal oversights during the mediation. Mediators frequently can supply clients with a list of mediation-friendly attorneys who will protect you from those legal oversights without undermining your choice to collaboratively negotiate.