Typical most receivers can only handle so many speaker pairs/groups. You may likely need an external switcher/amp too. Do you really want to send only (HD)TV sound to those other locations, or would you be wanting to send along other types of sound (e.g. CD, iPod, etc.)? Perhaps the decks could have their own 'zone', either w/ a receiver or additional piece of equipment (a la iPod docks, etc.). Also, do you have a desire for proper 5.1 surround sound in the (HD)TV viewing space(?)
FWIW, I have often recommended Crutchfield as a great online site both to purchase and receive additional info on what equipment is required. Definitely check that out since there's some helpful reading there for newbies. Good stuff to get your feet wet.
See my prior response to a similar question/setup:
Something small to power an additional 'zone' (=room, etc.)
I have no idea what I'm doing, so let me start there.
We just moved into a newer house that has built-in speakers. In the living room, there are 2 front speakers and 2 rear speakers. In the dining room, there are 2 speakers. On the upper deck, there is one speaker. On the lower deck, there is one speaker.
All of the speaker connections are in the living room (there are a lot of them). I'm guessing this means that I need one receiver, and whatever I'm playing on the TV there will play everywhere (there are volume controls for all of the speakers in the dining room and decks).
What I'm trying to figure out is what type of receiver do I need? I don't see how I can hook up all of these speakers from the connections in the living room wall to the back of the receiver.
Any help for a newbie?