Gear
As usual, early into every patch, we aim to get the highest ilvl items first purely because of raw intellect gain that outweighs perfect secondary stats on items.
Tier Set
The most important thing is to get the 4 set as soon as possible. The set isn't crazy good but still provides good value thanks to the interaction with our best secondary stat, which is crit.
Restoration shaman 2pc increases your critical strike chance by 10% while Healing Stream totem (or Cloudburst Totem) is active.
Restoration shaman 4pc increases the effectiveness of our critical strike healing from 200% to 215%.
Trinkets
For trinkets, we definitely want to get both raid trinkets that provide an insane amount of healing throughput and great secondary stats Broodkeeper's Promise and Whispering Incarnate Icon.
Embellishment
When it comes to crafted gear and spending Spark of Ingenuity, I'd suggest following a simple rule. If your weapon is low ilvl, go for Primal Molten Spellblade or Obsidian Seared Runeaxe with Magazine of Healing Darts or Potion Absorption Inhibitor as embellishment to get a huge intellect boost. Then get Elemental Larial, as it's an insane boost to our secondary stats. After that, it's nice to craft Alacritous Alchemist Stone if your trinkets are still pretty bad.