There are a number of different places to find documentation for setting up and configuring a DELL EMC array when using iSCSI. The "Host Connectivity Guides" for each operating system are available on EMC Online Support. These provide the steps needed to setup a host to use iSCSI. The product documentation also contains information on configuring iSCSI on the arrays. Look for the installation documents.
Support By Product:
Start by selecting the appropriate product (in your case the CLARiiON CX4 Series). In the next page is a Search window - search for "Host Connectivity Guide" and "Open System Configuration Guide"
From the Product Support page follow the documentation links.
Also, you can review KB 463477 which will provide links to other topics about iSCS.
Also its helpful to provide more detailed information about the type of network environment that you are using. What types of hosts are you planning on using, what type of switches are you using (for iSCSI you much use Enterprise class switches)?