Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
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.
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