Main points are:
-Use your potions and biscuits only when low on mana or health
-Try to prioritize the Manaflow proc while clearing minions
-You're most likely going to be a bit behind early game. The early Manaflow procs help with the latter half of laning phase

You'll hopefully have your mythic of choice by now, so you can start going a bit more free with using E and blasting through mana. A level 4 E can kill casters with the burn from the circle even without mythics/scorch rune. I end up holding on to the Corrupting Potion because it can be helpful in sustaining when combined with the Time Warp rune, as well as providing a little extra burn.