Add a new system ECC 6.0 to the Landscape

Hallo.

We have a three systems, ECC 6.0 with Oracle 11.0.2 on Windows 2003, Landscape

DEV----->TST----->PRD

Now we need to add a new system QAS so the landscape will become:

DEV----->TST----->QAS------>PRD

QAS will be a copy of PRD

To do this, are the following steps right?

1) install a fresh ECC 6.0 with QAS sid

2) homogeneous system copy from PRD to QAS

or

1) install an ABAP system Netweaver 2004s with WAS sid

2) homogeneous system copy from PRD to QAS

Could you help me ?

Thanks.

Mario