Items and abilities plz help

In games like dark deeds 5 there is a shop where you may purchase items. When you buy one your hero learns a spell permanitly and the item dissapears. Could some1 plz tell me how to do this?

1) make the item : "used automatically when acquired" (that option that tomes use in the item editor)

2) Make a trigger that tells

Event:
A unit acquires an item
Condition
Item type of (item being manipulated) equal to ( Learn Phoenix)
Actions:
Unit - Add Phoenix to (triggering unit)

3) Post these kind of questions in the trigger haven

4) thread moved