yes,yes you can.
Plug in your usb keyboard to one of the ports on your xbox (360 only), and anytime your in the xbox dashboard with the virtual keyboard (this is the keyboard that appears on screen when sending instant messages, ect.) you should be able to use it to enter text.
if it is a usb keyboard then yes you plug it into the usb ports if it isn't usb it wont work.
No, a PS4 USB cord is not compatible with the Xbox 360 for controller connectivity or charging. While both use USB connections, the protocols and pin configurations differ, so the PS4 cord won't function properly with Xbox 360 devices. If you need a USB cable for your Xbox 360, it's best to use one specifically designed for that console.
If its xbox compatible, yes.
There is a chat pad that can connect to the microphone port on the controller or you can just use a usb keyboard (doesnt matter if its wired or wireless)
Yes plug it into the USB
No
You don't use a USB CABLE. You use an ethernet cable from the back of your computer and plug it in the back of your XBOX360 to have XBOX LIVE. :)
USB keyboards that can be used with the XBox 360 are manufactured by Logitech. Other brands of keyboards, such as those made by Belkin, can also be used.
See related link below.
There are more than 1 USB ports on the Xbox 360, use another port.
either put a music CD in the disk drive or use a usb cable from a computer with music on it into the usb port on the xbox