1) Switch probably won't have any sales on Black Friday. The Black Friday ads we have seen so far still list the Switch at $300
2) No BC yet
3) Yes you will enjoy it, BOTW doesn't really make any type of past story references and the gameplay is very new user friendly. And the game is vastly different from past Zelda's.
4) There is no peripherals that are required for Switch. But I would highly recommend a Pro-Controller, screen protector and a Micro-SD card.