Venkata,
I need to say no, WAS z/OS installation is not the same as in distribute platforms. z/OS is z/OS
You need specific instructions, but like all other products in z/OS (DB2, CICS, MQ, IMS). Have you skills in z/OS?
The three links I have provided has the necesary instrucctions to install and configure ND topology. start from
WebSphere for z/OS - Version 7.0 Handouts for WBSR7 Wildfire Workshop
When you have installed and Admin console (or wsadmin), then yes is "like" distribute, why "like" because you have installed in z/OS so you have more or less %5 of diferences related to z Platform but the rest is the same (nodes, node agents, clusters, coregroups, JDBC, JMS, SIB,....).
You can follow the instructions from infocenter, but I think that is more easy the presentations I have installed from v5.0 (6.x, 7, and new 8.X) in z/OS following the presentations:
Installing your application serving environment
pic.dhe.ibm.com/infocenter/wasinfo/v7r0/... Hope this help.
regards