Until lvl3 you should play around safely and farm minions. When you get to level 3, depending on who are you facing on midlane you should either Try to pick up fights to get the first kill, or use you abilities to safely farm minions. You should try to get atleast 1300 gold before you first recall to buy the . With this item laning faze becomes more comfortable for you becouse you can spend your mana more freely. Leveling up your Q, lets you deal great damage to your opponent when there are no minions which would block your spell. When you get your ult you should roam other lanes. Taliyah's R is a great way to make your enemy unable to dodge the fight in a 2v1, or it will atleast force him to flash through your Ultimate.