Help with Trigger

Hey I'm kinda a newbie trigger but I know some stuff. Here is what i wanted to do. I wanted so you could pickout your own skills for your hero by going up to a shop and buying an item after that the skill is learned. I've been trying to get it to work but it wont detect bought items and the skill wont work. Some help please?

That will help you out just put an if in there to check for which item you want. then remove the item after you give the ablity.

Yes, simply do what he said, but under conditions, have an Item Type Comparison for the specific item. Then under actions, make something like this.

Hero- Drop Item Being Manipulated

or something like that, dont have worldedit open right now.