Modding Help!

HELP!

So, I'm currently developing a mod called "Better Than Vanilla" or BTV. I've added marble, granite, copper ore, copper ingot, copper pickaxe, copper axe, hoe, etc..

Now I'm trying to finish off the copper set by adding armor. I have created "EnumArmorCopper.java", "ItemHelmCopper.java", and the item properties in the mod_BTV.java file. But from here I'm stuck. The EnumArmorCopper file was easy but the what do I put in the ItemHelmCopper.java file? Am I doing this completely wrong?......
HELP!