QIf I summon a Riley, Hydroshaman from my cemetery with this spell, is the condition "if this card was put onto the field from the cemetery" in its Fanfare ability fulfilled?

AYes, it is.

QIf I select a Sarina Matsumoto in my cemetery to summon with this spell, does its "whenever you play a spell" ability trigger?

ANo. When you play this spell, Sarina Matsumoto is still in your cemetery, so its ability doesn't trigger.