[member="sabrina"]
The Pyrokinesis ability can become a very powerful technique, specially in martial arts (Airbender).
It can give you a defense, a offense, a range, and a close combat advantage.
It's more so what you do with it, and how you roleplay it, and write it that matters.
Honestly you want [member="Asher Kellan"] for this as he is way better at than I, though now maybe a different story

along with [member="Lexa Imura"] and @Nikolas Imura (Hope I spelt that right)
Essentially, you COULD make a flaming ball pretty damn large, it would take a mater to do it I would say though, as I know I cant do it...yet. You could make it literally rain fire if you were strong enough. Apart from that, to further help with these abilities, you should learn Convection, and Fire Shaping to give you the best control on your fire.