Hang on, are you saying that you want to wire in your own telephone instead of getting BT in to do it? If the line hasn't been in use yet then it's probably not live, have you called BT about this?
Info about wiring here
http://www.telephonesuk.co.uk/wiring_info.htm
but you would be better off finding out if the line is actually live and working properly before tampering with it just in case. You could even get a master socket etc installed by BT without too much fuss.
Another question is why is this in VM installation issues??