Ok I'm failry new at xbox ect.

I am trying to figure out if and how to carry the same character forward into addon's.

What is the order of playing the addon's in order to keep the same character? I seen several that all seem to be FO3 but I can't figure out which one's will do what want to do.

One other thing. Will the house in Megaton be destroyed? Other than the nuke in the middle of town.