Connecting Blu-ray to TV or Receiver

[aznav]

Mods - please move if this is the wrong forum. Being a newbie, I'm hoping I'm in the right place. Just purchased and received a Samsung BD-P 2500. I have an Olevia LCD and a Denon 5.1 home theater receiver. Questions:
1. According to the Samsung manual, using an HDMI-DVI provides best quality. I believe this cable carries both audio and visual, right? Because I have the Denon 5.1, will I lose home theater surround sound if I hook directly to the TV instead of the home theater receiver?
2. I also realize I will lose back speaker surround sound effect because I have 5.1 and not 7.1. Is this correct?
3. The Samsung player allows me to stream Netflix directly. Is the only way to do this through a LAM connection?
4. If it is only a LAM connection do I lose some audio and video strength? i.e. not as good a picture? I am techno impaired and recognize some of this may basic knowledge for the techies.
5. My box and router are at the opposite side of the house as my TV/BRP, do I have to bring them to the entertainment center or is there such a thing as a separate box or "Y" cable that would let me hook directly from my cable input. I'm guessing no as I am also guessing the cable signal may need to be unscrambled (newbie, here).
6. Last but not least (for now). My back speakers seem weak. I cannot seem to find a way to generate more power to those speakers. Is there not something like in a car that will let you generate more power left to right and front to back or is that supposedly all done automatically with the home theater receiver. Also, and again, pardon my ignorance, does the gauge of wire play any significance with the volume ability generated to the speakers?
Thanks for any and all help!