Your Priority is always getting to 7 mana for most of your minion (or 9 mana for Ysera, Unleashed) because that's where your game is really shine.
Sphere of Sapience is important anytime. In early, it can help you trash your big minon to end of deck. in late, it can help boost chance to get Ysera Awakening.
Use Guardian Animals if you low on hand or just want to detroy oppnent minion.
Always use Survival of the Fittest as early as you can (possibly after Ysera, Unleashed). usually Druid have 10 mana while opponent still around 5-6 mana. So it's still save even if you "waste" your turn 10.
Here is my Highlight of playing on Day 1 Scholomance Release