Hey Tana, EZSkin comes with a set of character definitions and presets. I have them installed in the same folder as I have the EZSkin3.pyc Python script file. They came with the EZSkin3 download, and all you need to do is install it and then open it in P11/PP11.
Then you would just need to click the first icon at the top of the EZSkin 3 palette and select Figure definitions > Import definitions, and browse to the folder where you saved them. I have them saved as follows:
Runtime > Python > poserScripts > ScriptsMenu > SnarlyGribbly > Figure definitions
There will be a Legacy figure definitions.defs file, which will include V3, V4, M3, M4, Aiko, etc. I also have Pauline.defs, and Dusk.defs and HarryHorse.defs as well, but I don't recall if I got those from Snarly or elsewhere.
While you're importing the definition files, you should also import the Presets, which will be found in the same SnarlyGribbly folder.
That all said, there should be an Installation.txt file that explains where to install the script and the steps needed to import the defs and presets. Hope that helps.