Fan of Knives spell modeling help

[BmapVmakerZ]

Hey everyone, i was wondering if anyone could either give me advice or asistance on making a spell. My idea is this: A spell very similar to Fan of Knives, with the tracking and the damadge and all that fun stuff, but instead of knives it would be fireballs. I think the models would need to be changed, but im not sure. If anyone can help, that would be great