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I usually start with the valence electrons and single bonds then count the number of electrons and adjust the electrons. After, I take into account formal charge and look for the structure with the lowest energy, taking account expanded octets.
You always prioritize the number of valence electrons first. Counting the valence electrons is what allows you to draw out a rough sketch of the Lewis structure for that molecule. Formal charge comes into play last, when you're trying to figure out if what you have drawn is the best representation of the molecule. The formal charge always has to be as small as possible.
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