need some Help...

Hello sythe community I need some expertise on what pc to buy mostly to run World of Warcraft at high or max settings and runescape 3 are the most games I will be playing the most.
I don't know how to build my own desktop so I'm not quite sure where to look.
Can be desktop or laptop every answer and opinions Wil be very much Apreciated !

Please leave links below.
Thanks alot for your time !
Most games wanting to play
RS3
WOW

My Budget $400