To create a new virtual machine just connect to your Oracle VM Manager (http://hostname:7001/ovm/console) and select your Server Pool
On my server pool I have only a server machine
It's suggested to insert the same values for Max Memory and Memory (as I did not at that time) because as stated on Oracle VM (Release Notes for 3.0.3) http://docs.oracle.com/cd/E26996_01/e18546.pdf pag.12 you can incur into kernel panic problems.
HVM Guest Kernel Panic
HVM virtual machines with Linux, Solaris or Windows guest operating system may experience kernel panic when the virtual machine is stopped and started several times.
Workaround: Set the Maximum Memory and the Memory fields to the same value in the Create/Edit Virtual Machine wizard.
It will continue in the next step