So far, only 9 have been confirmed, but there will probably have about 6 or so more more with the final release. Plus the DLC.
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Yes, you do.
No. ODST doesn't have multiplayer, excluding firefight (which can't be forged, and not even for matchmaking) and co-op campaign. But ODST does come with a Halo 3 multiplayer disc, which includes all of the original multiplayer maps and the DLC maps. That disc also includes forge mode.
you go to recent maps if its not their then its gone sorry.
YES! Halo reach has a "Forge" feature, which allows players to create maps, the reccomended map is forge world.
No. I'm sorry 2 say that I cannot possibly answer this question, as I have just recently started playing halo reach and do not know a lot about it.