I highly recommend using the skill calculator on the home page, it give an overview of how to place your skill points.
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Lightning Bolt Level 2
Rain Of Fire Level 2
Meteoric Destroyer Level 2
Thunderer Level 2
and for the last slot I recommend
Delphic Thunder Frenzy(only to fill last slot, I don't recommend any heal because you will get to 5 attacks the the WB will use ultimate attack ,doing millions of damage)

My WB skill tree
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when you attack the WB as soon as your character animates hit your Lightning Bolt, it will add an extra attack , do this for each attack.
if your character does not animate but still attacks ( with the basic attack{mini fire ball**) quickly hit your Rain Of Fire ,to get the extra attack .

I hope this helps
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