When It's Early Game and you're in mid lane, last hit minions with your "q" so that you can build up pyromania and save on mana due to doran's ring. When You Have Pyromania use it on an enemy champion so you can harass them. When your level 6 build up your pyromania then use it against the enemy then Spawn Tibbers. After you Spawn Tibbers spam all your other skills Then you will get the kill.

When you gank stun the enemy, summon tibbers, and spam all abilities

If you win then you win

If you lose, don't blame it on the guide. It might not be your preference, and that's why other guides are made. Don't go looking at a guide and think "If I follow this guide I will always win" because guides are guides. They are there to guide you. Not to tell you exactly how to do things, but to teach you how the people making these guides do things and you can maybe change it to your reference. So if you do blame the guide on losing follow another guide. Thank you