1/ To create a disk image file -- Qcow2 format 
     # qemu-img create -f qcow2 -o preallocation=metadata fedora15tbx.qcow2 5G

2/ To install the OS
    # $qemu-system-x86_64 -cdrom /export/isos/Fedora-16-Beta-TC-x86_64-Live-Desktop.iso \
      fedora15tbx.qcow2 -m 256 -boot d -net nic -net user


3/ To boot the above created guest,
    # qemu-system-x86_64 /export/vmimgs/fedora15tbx.qcow2 -m 256 -boot c -net nic -net user

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== OZ (VM Builder) == 

1/ https://github.com/kashyapc/virt-scripts/blob/master/oz-jeos.bash


Refer -- https://github.com/kashyapc/virt-scripts