Since according to the Mattel's UNO FLIP! rules there are no special instructions for a
Flip Card turned over at the start of the game.
NOTE: If any of the Action Cards (symbols) are turned over to start the DISCARD pile, see FUNCTIONS OF ACTION CARDS for special instructions.
If the card turned over to start the DISCARD pile is a
Flip Card you should "flip over" all the cards and play the Dark Side.
Flip Card – when you play this card, everything flips from the Light Side to the Dark Side. Once the Flip card has been played, flip over the Discard Pile (the card just played will now be on the bottom), then the Draw Pile, then everyone’s hands must flip to the other side...
Question 2 is answered here:
What to do after flipping the discard pile in Uno Flip?