How do I apply a shooting effect to my sprite?

This would be a better fit in HWS, requested to be moved.

Which aspect of the shooting do you need help with? The sound? The display? The bullet path?

In general, like bullet path and effects

This article should help you with the bullet scripts. https://en.scratch-wiki.info/wiki/Shooting_Projectiles

As for the effects, you would likely get better assistance by asking for help in Requests, or by visiting one of the shops in the Show and Tell subforum which offer design services.

Thanks!