1 More Time: Clarifying How To Do Mash-up Using A Variey of Custom Marker Icons

Hi WPMU People: I've read this support topic thoroughly and I realize that I'm retreading well covered ground here. Still, I've tinkered around with the plug-in for a while and I can't get it to do what I want, So once again, for those of us in the slow class:

Lets say I wanted to create a mash-up map displaying local Flower Shops, Liquor stores and Funeral Parlors (apparently some has passed-on in this hypothetical), and I want the Flower Shops to have a flower icon, the liqour stores a whisky bottle and the funeral parlors a tombstone. How how would I do that?