1. If you buy a new one that has a motherboard that supports USB 3.0 then they would. I don't think USB 3.0 is characteristic of gaming computers though. USB 2.0 and 3.0 are the same size but typically 3.0 ports are colored blue. USB 3.0 is backwards compatible so 2.0 or 1.1 devices will work, but they won't work any faster than they normally would.
2. That's not a question and we can't do it anyway because it's illegal.
3. If your TV has an HDMI port then you can get a DVI to HDMI adapter to plug it into your TV's HDMI port. Of course most new graphics cards have HDM ports so you may not even need an adapter. Since it's LED, I assume it has HDMI connections because LED TVs are a relatively new trend. You may need to refer to your graphics card manual to see if it can output sound through HDMI (I think most newer ATI cards that are at least HD 3000-series or newer have it. I think at least the Nvidia 200 series and newer does as well(, You will need an external audio cable if you want sound from your TV otherwise.
1) USB doesn't really relate to the performance of the desktop, it's just a way to transfer files from one computer to another, but USB 3.0 shows major improvement with speed compared to USB 2.0, so no, gaming computers doesn't necessarily have to have USB 3.0.
2) Search it up, if you can't find it; it's most likely not going to be there. Try Google - it can be your best friend.
3) Yeah you can, but keep in mind, you need a good video card to play games on a 32" TV because it has a bigger resolution than a typical monitor.
Q.2 can be dificult to find..you might try piratebay
Q3. you can hook up your tv to your desk top as a second monitor if your graphic card supports dual monitors either by a VGA or DVI connection and in new graphic cards Display port (which you will need an adapter from display port to VGA or to DVI or to HDMI
make sure your tv has either a VGA or DVI just in case thats what your graphic card requires for the second monitor if its HDMI dont worry, tvs now come with at least 2 HDMI ports