Only take fights you can handle or are sure you'll win, taking ignite is worse than taking something like barrier or heal because if you really need ignite to kill someone then it isn't worth the risk fighting them.
Only take ignite if you're a champion like

In laning wards are a MUST, if you don't have any then freeze your lane. Keep in mind that your turret can't protect you after everyone reaches level 10-13. Keep every lane pushed, don't just push one lane. If you know how to create a super wave then do it. Then ambush the person that comes to clear out the wave, take another person with you if you can't 1v1 them. Keep in mind that when you push waves, they'll push right back into you after a few minutes.