You want to install OpenStack Folsom with Quantum and you don't know how ? This is what you are looking for !
It's easy, simple and tested. Can't wait? Go check it by yourself:
Note: Folsom + Quantum on GRE-Tunneling : is available on stable/GRE branch:
Note: Folsom + Quantum on VLAN with 3 NICs is available on master branch:
Note: Folsom + Quantum on VLAN with 2 NICs is available through VLAN/2NICs branch: