Hi – some very basic advice please

:-
I’m thinking of joining up my desktop PC (upstairs) with a PS3 in the sitting room. I would also like to access the Interweb via the PS3 on the flat screen telly. (Will I be able to access the music files / pics on the PC also from downstairs?). I had thought about a wireless solution – this looks too complicated / hit and miss for me and am now thinking about a wired solution – couple of basic questions – and yes, although I have read the sticky --your dealing with an useless ludite here! and time is short etc…
1) If I go for the plugged solution using the electric ring main how many plugs do I need – just the pair? One plug downstairs and one up?
2) I don’t have a telephone jack plug in the sitting room and use a telephone line extender already for the Sky + box. (Called “All for One” or “One for All all” got it a few years now and it works well. – Will this interfere if I also use said home plugs to access the internet?
3) The socket out situation near the desktop and telly is oversubscribed at present - Is there the equivalent of a double plugged Home plug? I’m thinking 1 home plug in each location and a 4 ganger hanging off this for the other bits of kit?
4) How do I link this together? :- Downstairs Home plug “Cat (5?) Cable” joining the PS3 – the home plug. Upstairs Home plug to Router and in this room, router connected to the Talktalk Modem with Ethernet connection; and the PC connected to the router?
5) Please suggest a router Netgear or Linksys (or othr?) and model – something that will work and sets up easy?
6) Re the cable does it come with the connectors on or can I buy one piece cut it into two and (easily) put the connectors on myself?
7) Where can you get the cable from on X-mas eve – PC world!!?
8) Suggest a home plug and do I go for the 200mps and where can I get one from a shop?
9) Will the chipset on the Home plug be something else to worry about - does it matter that I have a "one for all" line extender already on the mains and I don't know if this has a chipset or not OMG??!!
10) While you on any chance you can pop round and set it up for me in the home!
I’m at work (now) and until X-mas eve – researching this is going to be difficult – sorry to ask so many stupid questions.
Season’s greetings
BoaT