Two Questions, Creating Custom Weapons and adding items Options

[Garet]

Well, here are my two n00b-ish questions:

1) Can anyone link me to or tell me how to create custom weapons and armor? I.E. I choose a graphic, then give it a name, add stats, etc.

2) On the Cheats page, it says to add an item use player.additem [itemID] #. So, for example, I would type player.additem 000ADDAA ? I tried that but I always get a wierd error and nothing happens.

Thanks for the help.