2. How do I find the wire for the high beam to switch on the HID lights
The easiest place to find the wire for the high beam is to take the side panel off and locate the relay that switches the high beam. If it's not labelled, just operate the beam switch and locate the relay that clicks. You can tap the wire going to the light or the signal wire coming in to the relay.
A less elegant way, but that uses a shorter wire, is to tap the lead to the high beam near the light itself. Usually harder because of the wires being cabled together there.
Just make sure you only use that wire as a signal to the relay, and don't feed it directly to your lights or you'll blow your high beam fuse.
Brock will wake up soon and provide the technical refinements...