Random Forest Set Up From Excel Spread Sheet

Greetings,

I'm attempt to set up a decision making tree using random forest. I have an excel sheet with all my data and I was wondering if anyone had some good tips, or guides on how to accomplish my goal. The end product should be a decision tree that helps show environment traits that best aid anuran diversity. Any tips and trick no matter how basic are welcomed! I've programed in GML, but that's about the extent of my experience.

Thank you,