Kenclean -
To learn about polishing marble, I recommend you visit dirtygrout.com. It is an outstanding forum for tile, grout, and stone topics. These is actually a current thread that is similar to your issue:
http://www.dirtygrout.com/forums/sho...ions-6620.html
Register on the site, spend some time looking through the past threads using the search function to find the issues with which you need assistance, then join in by asking your questions.
You'll also find a lot of information regarding training for stone maintenance and restoration.
Dave