If you search Fireball in Roblox, there will be some results. First is Fireball by Dramonx which is a free model. This model was updated on March 30th, 2018 and it has 3 favorites. The Roblox ID of this fireball is 1564014504. In the description, it is said that it is working throwing fireball, working animation, does damage and does super cool effects.
But, how to make or script fireball? You may come here because you want to know how to make or script fireball. If you try to search Fireball script in Roblox, you will find at least 3 of them. First is Fireball Script (Press “Z”) by twitch_oneoa which was updated on February 21st, 2016 and it is a free model with 2 favorites. Second is Fireball Script by Crimsonal which was updated on February 24th, 2013 and it the a free model with 1 favorite. The last is Finished Fireball [From scripting tutorials] by Friaza which is a free model and it was updated on November 18th, 2012.
If you are looking for a script of Fireball, actually you are able to find the script in the scriptinghelpers.org. In that site, in the Questions section, there is a question about how to make his Fireball launch when a person clicks on the computer or taps on mobile. In that question, he also adds the script. Then, someone answers this question with a complete script. So, you may be able to use that script for Fireball.
You can also watch some video tutorials about how to make or script a Fireball in Youtube. Two of them are Roblox Tutorial 3: How To Make/ Script a Fireball which was published by Dramonx on March 30th, 2018 and now it has been watched more than 2K times and also a video of Jezar entitled How To Make A Fireball – Roblox Scripting which was published on January 11th, 2018 and now it has been watched more than 34K times. The video of Dramonx is 37 minutes of duration and the video of Jezar is 15 minutes of duration.
In the video of Dramonx, you are able to see that he makes it in a Roblox Studio and he starts it with choosing Fire particles for decals in the toolbox and then he choose the right color for it. In the minute of 11:21, he make the script of it. You are able to see that he inserts the script one by one. In the description section of his video, there are links to the model and Animation that he uses in his video. So, you are able to use it as well.
In the video of Jezar, he starts his video by shooting his Roblox Studio. Then, he directly inserts the script of Fireball. The duration of this video is not as long as the previous video. So, you may start with watching this video if you want. You are able to see the script of Fireball there and then apply it in your Roblox Studio.