Newbie Help Please!

Hi all,
Just got my new series 5500 (40PFL5527H/12) out of the box, and very nice it looks!

Just a couple of questions to help me in the set up please,

Is there a recommended keyboard / mouse I can purchase to speed up scrolling through websites, and do I need to instal any software into the TV?

What software do I need to instal onto my PC to enable me to stream video / music etc to the TV?

Why does YouTube freeze up?

Please help!

Make sure that the firmware is upgraded to its latest version. I am also looking for a keyboard and mouse available for it, but I doubt there is any. http://imagicon.info/cat/12-19/redface.png