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I wanted a campaign involving fighting over a system between the Imperial Navy, A number of Titan Legions, the custodes w/ a Revived Emprah & the forces of Chaos
It would combine BFG, Epic, 40k all at a large scale, and have rules where if the enemy's Titan Legions, or Fleet were destroyed the player who won those situations would gain an advantage like more points for the other endeavors, backup, and orbital support.
I don't know where to start with this.
Help is appreciated

This is pretty much the foundation of a multi-game linked campaign. I've seen these done before where game 1 of the campaign is an orbital space battle using BFG rules. Once the winner has been determined, the next game (epic or standard 40k) might get some free orbital strikes or something.

It can apply to work over a lot of interacting games. Perhaps a Kill Team game to determine who controls a crucial comms relay for the Apoc game and so on.

There are some ideas here http://www.warseer.com/forums/showthread.php?332948-40k-Campaign-including-BFG&p=6135127&viewfull=1#post6135127

You can find a lot more if you put "multi-system 40k BFG Epic campaign ideas" into your search engine of choice (don't use the quotations, though).