Movement is key to survival in this game, practice movement to farm everyone in the lobby.
There is no need to practice aiming because it does it for you.
Another thing is that when someone stops in-front of you by holding ‘s’ (you can fly right by them), make sure you keep good distance were you can easily hit them with a fire ball and close enough to hit them with your fire breath.
P.S. Learn the layout of each map for easy traversal and corner cutting to put your enemies of guard.