If I didn't have a Wand of Woh, I'd still be running Heat Wave as my main ability (right click). For the left click ability, your best option would be MM-Conflag, but that also requires a specific legendary (Mirrorball with +2 Missiles, make this your gambling priority). Until you have that, go with either Flame Blades or Electrocute-Surge of Power. Both are just there to buff your Heat Wave, either by increasing its damage or by gaining you more AP.
The rest of the build would be the three buffs (armor, force weapon, familiar) and Teleport(!!). Seriously, Teleport is godly since the patch that changed its range.
Itemwise, you have the most important piece with the Cindercoat, so just go for some more fire damage, Heat Wave damage, crit etc.