What does the PC connect to when u have 2 wireless routers in the home?

i am hoping to buy 2 routers(wireless), one for the computer and one for a BD player. what does the computer plug in to and what connection a network or a USB into the router or modem? i am not knowing of networking and such. and the routers eem to have a software CD, i guess for the driver. but what about the other end , i am wanting to connect a Bluray , do i need a router CD for that too?