As far as looking through the thread, all the relevant posts for the official backup camera kit are linked in post 10, including downloadable directions.
That is not a straight forward question and my guess is no one really wants to touch it, but here goes...
No you wouldn't need a flash, but there are stipulations.
- you would likely have to get an oem to aftermarket CanBus backup camera interface module so that your radio gets the backup trigger signal it needs and the factory Camera video signal at pins 31 & 32 get converted to a standard composite video (yellow) plug.
ie: CRUX SWRCR-59D
http://www.cruxinterfacing.com/products/SWRCR-59D/index.html
This is all dependent on what you have already done, what factory harnesses you've cut into etc. You would need to start a separate thread for help with that if you have further questions, since it really is outside the scope of this thread about installing the oem camera to the factory radios (although the same thing if you get that Crux module).
Good luck.
Seems about right for an hour of labor, even though they can probably do it in 20 mins if they know what they're doing.
Sent from my non-flammable Galaxy S7!