I'd beeline Arcane Lore and kill everyone with Hemah (assuming you have fire mana).
But fear not. There are many great and small mistakes to make and many turn to your advantage.
Among things to avoid:
Failing to declare nationality on turn 1 and having your animal killed by AI.
Forgetting to change civs/religion after planning for many turns to do so during a golden age.
Allowing great people to be killed by AI hidden nationality units/assassins.
Failing to trade a mana type for
all of an AI's resources and cultivate that trade with cancellations/additions on the same turn when available.
Forgetting to capture a mana node for a spell sphere you have been planning on.
Giant AIs suddenly appearing, setting fire to your entire civ and threatening to overrun you.
Not having workers ready for blight.
Failing to spread religion.
All of these terrible things, and more,
will happen to you...
Basically, get used to rolling with it
And Hemah is not a bad way to roll.