[Users] internal networks in Ovirt

Hi, I just installed ovirt 3.3 and got everything up and running with an ovirt node. However, I can't figure out how the networking works in ovirt. First of all, I'm looking for a feature like you have in virtualbox: configure bridged networks, internal networks and natted networks, how do you do each of these in ovirt? Also, I have only one physical nic and ovirtmgmt default network is already assigned to this nic. How can I attach other bridged networks to this same physical nic? Thanks for any help you can provide!