Elemental Shaman
Rotation
Opener: Totems down (Mana Spring, Strength of Earth or Tremor, Searing), Flame Shock, Lightning Bolt.
Priority: Lightning Bolt as the filler, Chain Lightning on cooldown on packs, Flame Shock on the boss, Earth Shock only to interrupt. Forever removed Lava Burst for Call of Thunder, so the rotation is bolts and shocks.
Cooldowns: Elemental Mastery for a guaranteed crit; Grounding and Tremor Totems as needed; Bloodlust is not in Forever's Classic-era kit.
Forever notes: Mana is the limit: Water Shield is not in Forever's Classic spellbook, so bring potions and Mana Tide if the build has it.
Stats
Spell Hit (Elemental Precision is not here, so gear it), Nature spell power, Spell Crit (Elemental Fury doubles crit damage), then Intellect, then mp5.
Lightning Overload makes crit worth more than its number suggests.
Numbers for every spec and a gear comparer: stat weights.
Where it ranks
See the tier lists for PvE and PvP placement, and Classic vs Forever changes for what Blizzard altered in this class.
Wowhead and Icy Veins keep spec guides of their own: Icy Veins Elemental Shaman, Wowhead class guides. Our rotation notes are editorial, written for the Nov 2 tuning.