may anyone explain to me what do i need to do to run a PHP Script using JSON RPC settings ?
(not about the script part ..about the server part)
About dedicated server / what exactly is that /where do i buy it / do i need any special configurations for each script?
Thanks

Best would be a frontend web server, which can be anything, but should have a static address. Run your bitcoind on a machine you have physical access to.
http://www.bitronictech.net/aff.php?aff=061 is a great webhost, and pretty cheap as well.
Thanks for the info ,by the way..