This is kinda of a big question, but, how do you set up a campaign mission for you map? I have v 1.3 If it is required. Sorry if this has been answered before.

try looking in the everything you need to know thread - I swear there was a topic there that showed how to set up basic objectives for a mission.
Also the Mission Scripter in the assets thread will help remove the guesswork out of making a mission too.

Ok I found it. (I swear, that wasn't there before.) Sorry for this, you may lock it.

No problem

For a Campaign mission, use the c game mode and pick any era. In order for the C game mode to be displayed in the map selection screen, you will need the v1.3 patch. If you want to allow people who don't have the patch to play it, use a normal game mode, such as con and then use the v1.3 patch's features to rename it to Campaign.