After so many tries
I managed to install Web Center Space , on top of PreBuilt VM provided by Oracle using VirtualBox on MacOS , just to get an overview of Web Center.
Since it requires lot of memories, i think i should enable the vm to run with no gui like the SOA Suite Prebuilt VM.
Later , i will access the WebCenter in my Host browser.
Anyone can give me some tips,links to tutorial, would be appreciated, thanks...