Hi,
you start by adding an ArrayList or HashTable component to your gameobject,
1: select a gameObject
2: add component via the menu PlayMaker/Addons/ArrayMaker/Add xxx proxy to gameobject.
in your case I think you can go with an ArrayList.
fill in data ( select the type, and the amount of items, and then populate them).
At runtime, you have a whole set of actions to get, get random set, delete, find, items in arrayLists.
Bye,
Jean