QIf this follower is somehow sent to the cemetery immediately after being put onto the field, can I put it from my cemetery back into my hand with its ability?

AYes. Depending on when the ability is processed, you may be able to select this card from the cemetery and add it to your hand.

QCan I choose to not put any followers from my cemetery into my hand with this follower's ability?

AYes, you can.