you go to recent maps if its not their then its gone sorry.
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Yes, you do.
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.
Refering to halo 3 and halo reach their is a custom forge game mode, here you can build and shape your very own map creations for both custom and recreational use.
None known yet sorry but keep an eye out only hacks and glitches like glitching out of campaign maps.