You may not notice the difference directly in PQ, but may in features of moves, features of the player (especially network connected ones), and that at some point, new movies will only be released on Blu-ray,
You need to go buy a proper surround receiver. It is what does all the work of decoding the surround from the optical out, to 5.1 channels, processing it with a level control and other adjustments, and amplifying it for the full range speakers. You will need an active sub which has a line in.
You need to buy and install one, or buy and install a DVD player app.
And yes, I said buy, because the DVD decoders that are missing need paid for because of patents and licensing.
You need a DVD-Video. It is more that a file format, but a folder and file structure, plus burnt in a special media format.
You need a DVD authoring software such as Windows Movie Maker, Nero Vision, or iDVD on Mac.
Good apps will be pay.
To get the most of it yes, but to just use one, no, if the player has composite A/V outs.
Some newer Blu-Ray players only have digital outputs, often the cheaper and more compact players.
Easiest way is to figure how the handset works. It is basically a keypad with send data from the keys and hook sensor, a display, and send and receive audio.
With that, you need to re-build the radio unit, with a GSM board, or even a phone you can control over its serial port. You have a...
You cannot wirelessly transmit the dish signal, at least not practically.
You can get wireless HDMI extenders. You get the receiver installed where you can acceptably get dish coax ran to and a receiver installed, but close enough to the TV for the wireless HDMI to reliably work.
Get a...
For an internal, SATA data and power (power is usually built into the power supply). A retail drive probably comes with the cable and attachment screws. And OEM drive may not.
An external drive will use USB or eSATA, which may be that only, or that plus a power adapter. A retail one should come...