QIf I have 4 cards on my field including this follower when playing its Fanfare ability, what happens?

AYou would resolve the ability as normal, except you would choose 1 of the revealed followers to summon and shuffle the other with the rest of the revealed cards before putting them on the bottom of your deck.

QIf I reveal all the cards in my deck and only reveal 1 follower that costs 3 or less, do I still summon that follower?

AYes, you do.

QIf I reveal all the cards in my deck and don't reveal any followers that cost 3 or less, what happens?

AYou would shuffle all the cards you revealed and put them back in the deck area.

QIf I evolve this follower with its automatic ability, can I evolve another follower using its evolve ability in the same turn?

AYes. Although you can only activate one evolve ability per turn, other abilities that evolve followers do not count towards this limit.