Question for network chip/card etc

so my first time pc build help enter link description here

um, since i do have router and,, it is impossible for me to connect by wire,..
that being said, since its my first build i dont know if i should buy something like network card/chip etc..because i think i heard that i'm suppose to buy this in order to connect to router wireless....
if so can you guys please give me some good idea which card/chip/usb that i need to buy. ofcourse something that it is GOOOD~ :) as long as it is recieving all the speed from the router then its fine. thnkx guys.

Yeah, powerline adapters are easy and more reliable than wifi.