Do Scorcerers have to use this skill each time they use a wand? Could someone give me a general outline on how this skill applies to scorcerers. Thanks.
If they're using a wand that casts a spell on the sorcerer/wizard spell list (not their specific spells known, but the entire class list) they do not need to use Use Magic Device.
For any other wand, they would.
It applies to sorcerers the same way it applies to everyone else.
If the wand spell is on their list they don't need to use UMD at all.
IF the wand spell is not on the user's spell list or the user is not a caster than a UMD roll needs to be made for each use of the device.