Implementing a Custom Game into Multiplayer Matchmaking?

I know that Bungie has a track record for implementing user made content into matchmaking on the multiplayer server such as grifball, rocket race, slayer maps, etc. I have created multiple versions of “Paintball” game type such as normal paintball, ctf, and territories as well as multiple “fields” to play the game types on from speedball to woodsball.

How would I go about submitting them for review in hopes to get them online?

I recommend reading this FAQ. It should help you understand the system and how it works.