on the home page go to main menu then go down one to matchmaking.
Chat with our AI personalities
You change the play list in Multiplayer.
no you cant
Halo Reach is definitely for single player. Campaign and Forge, you can do alone, but you will get the most amount of entertainment out of the multiplayer modes.
An approximate 8.4 million people Play Halo Reach a day
they dont have a firefight demo for halo reach soz