How to get IP for the VMs?

I have created some VMs in the freshly installed/configured proxmox 3.0
but when i logged into the VM running CentOS 6.4 that i created and ran "ifconfig"

i received

inet addr:127.0.0.1 Mask:255.0.0.0

How can i make it get a class C IP address of the network so it can communicate with other system on the network?
Is it that i have to create bridge networking or something? If yes...how can i create bridge networking? Any guide for this on the doc?

Thanks.