The enchanter automatically learns them when you speak to him (or when you enter the enchantment menu, I forget which). Any still left in your inventory can be safely disposed of - at least I think so, save and check afterwards that your enchanter seems to know them!
In short, all you need to do is ask him to enchant something. As long as you have the items he requires in your inventory (or your coffer, I think) he can get on with it.
