Review your documents and evidence
Gather all the relevant evidence and organize it. Review it all carefully. Understand the other side's position and review their evidence.
Bring key documents and evidence to refer to & support your arguments
Preparation is key. Having everything there to assist you can only help.
Work with your attorney to determine your "bottom line"
Spend some time preparing with your attorney in advance (not the morning of).
Understand the other side's claims (your weaknesses) and prepare to address them head on
So that you can make informed decisions, you should be aware of your case strengths and weaknesses.
Consider many different settlement options (payments over time, restructuring, etc.)
Think out of the box. Money isn't always the only way to resolve a matter in Mediation.
Don't draw a line in the sand early in the Mediation
You want to remain open minded and keep the process going as long as progress is being made.