How Does Skill Flash Combo Work?

I was watching an Ahri guide and noticed one of the combo was a flash+charm and flash+orb. How do you do that? Do you cast the skill and then flash? Or do you flash in then land in your skill? Also, if you were to flash at the sides, how are you suppose to land on your skillshot on the enemy? Do you do this: {{summoner:4}} then charm? Or: Charm then {{summoner:4}}
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