the alien vs predator (avp) mod is really cool but how do I get it I can not find a good site to get it.
Minecraft villagers! I love my Minecraft villagers!! and aliens! https://legomylife585.blogspot.com/
"We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far."
If you are looking for a good mod site, then Minecraft CurseForge should be your go-to. Sites like 9Minecraft and Planet Minecraft tend to re-post mods created by the original owners, so do not trust them as the files may contain viruses.