Home Network Connection Problem

I already have a home network set up in my home.
The internet from ISP connect to a modem, then the signal connect to the router and then I use a CAT 5 cable to connect to my PC.
I bought a Skype phone recently, and I want to install it in my room.

Should I buy a router, switch or hub in order to split the singal in my room, is it possible to do that? Will this make my network more complicated?

I also need to spilt my phone cable into two....any nice phone cable/port splitter?
Thanks!