Did not find a simple way to setup network on arch, so here is a realy quick and easy guide to setup network on arch

wlan0 dhcp

nano /etc/netctl/wlan0
and put this inside

Description='wpa wireless'
Interface=wlan0
Connection=wireless
Security=wpa
IP=dhcp
ESSID='MyNetwork'
Key='WirelessKey'

now you can
netctl enable wlan0 && netctl start wlan0

dhcp eth0

nano /etc/netctl/eth0
and put this inside

Description='eth0'
Interface=eth0
Connection=ethernet
IP=dhcp

now you can
netctl enable && netctl start eth0