Good advice above, but also:
If you are making a campaign of that size and plan to release it... please PLEASE play through the whole thing in debug mode and fix the warnings!
I mean, it might be overwhelming to do, but at least be aware of the bugs so that a player can play through your campaign without crashing himself/herself.
Also check fred logic to make sure every mission is beatable, and accounts for everything the player can do.
Sorry for the derail, but these issues appear frequently when people appear out of the blue with big campaigns. Make sure everything runs smooth.