I`m SURE there is a tutorial or something here but I have no idea where to look, the "everything you need" thread doesn`t have it as far as i`ve seen, or maybe it`s just not called "how to make a campaign mode". I would like to do things like add that pop up objective thing (ya know, it pauses your game and has text on it) as well as adding those arrows on CP`s and stuff

So if anyone could link me to a tutorial or something then that would be awesome

This should be helpful to you: viewtopic.php?f=27&t=16751&hilit=Campaign+Tutorial. This tutorial doesn't cover all possibilities of campaign mode scripting but it should be a good starting point.

Reading the Battlefront2_scripting_system doc may also help you to comprehend the Battlefront 2 programming fundamentals needed to create a campaign script.

And lastly, you can always look up the campaign scripts that Pandemic made. There you can find examples for pretty much anything that is doable in a campaign mode.