There are various mounts on the market......Ram, Migsel, Touratech etc. Some Navs come with a full bike mounting kit, usually Ram.
As for wiring it on your bike, I avoided the Canbus and took the lead straight to the battery. The advantage of this is that it does not power down when I switch off the ignition so I can still change routes etc. It is also very easy to fit yourself.
I never leave the Sat Nav on the bike, so draining the battery is not an issue.
Hope this helps
Mike