Can i buy a home cinema system without the player because i all ready have a blueray player?

You could get just a receiver and speakers but it will probably cost more than buying what is commonly called a Home Theater in a Box. Those are usually much more compact units with the speaker and sub woofer, the "player" which also acts as your receiver. Your Blu-ray player cannot act as the receiver for the speakers. All it can do is play movies. But since you have the Blu-ray player, you could get one with just an up converting DVD player and save some bucks on that end. And DVD players (and Blu-ray players) also play music CD's.

Yes. in fact, most of them are that way. They are usually called Home Theaters. You might have better luck finding what you want if you buy a home theater receiver and a 5.1 speaker system. Another term is A/V receiver. Here is an example http://www.bestbuy.com/site/Onkyo+-+700W+7.2-Ch.+3D+Pass+Through+A/V+Home+Theater+Receiver/9846341.p?id=1218183109742&skuId=9846341 Then pick a nice 5.1 speaker system that is rated at a minimum of 125% of what your amp is rated at. In the above case, that would be 125%.... Oh, and as for 7.2... The two extra rear channels are under used. As for 2 subwoofers, they can counterbalance each other so that there are no dead spots in the room. Audyssey is a very good computerized self balancer.

yes i am pretty sure you can

Buy one with a DVD player, but make sure it has a s/pdif input so that you can connect your BD player. Or buy an AV receiver + speakers.