In Autcraft one of the rules is no building outside of your protections, does this mean that we have to build mob farms iron farms etc inside our protections or is it just paths, bridges etc? Also can we have multiple protections?

You can have multiple protections, and everything should be in a protection.

This is to help preventing griefing, stealing, etc.

Also is there a limit to the protection size?

And what if I want a build that everyone can use? (It’s fine if that can’t happen)

VastCreator3547:

Also is there a limit to the protection size?

There is not, it just must be a size that you will use.

It's up to the admins discretion if they think it is too big. 

VastCreator3547:

And what if I want a build that everyone can use? (It’s fine if that can’t happen)

You are able to request for everyone to have access to chest and/or the ability to place/break blocks depending on the build.

Can I have a bigger area just to look good?

Basically, you can have as many protections as you want, as big as you want, but all we ask is that you actually USE the space you're protecting and not just protecting it just to have lots of land all to yourself.