Max E first, charge it up on minions and then harass. If it's an AP mid he'll probably rush Zhonya's Hourglass first to try and block the damage of your Q, so he won't be building against the magic damage that your E does.
It mostly just depends on the matchup, I was against an Ekko so I wasn't poked out and was allowed to freely farm and take control of the lane.
2stronk