Question about how to do a special effect on a film project.

For example I want to change my eye to look like a Sharingan look in my video and fight like that. Or maybe just show it temporarily. I want to know how to do a special effect like that.
Answer #1
More description needed
Answer #2
for public use (idk wtf movie companys use) but for general school work and all that crap most people use after effects that might help you a bit.
Answer #3
did u try to find out at youtube?