Hello

I want to implement Excel Services in SharePoint Server 2010 on SCSM 2012 sp1 (Self-Service Portal ) and SQL SERVER 2012 SP1 Environment.What are the per-requisites involved for implementation and steps required before Deploy Excel Services and Creating an Excel Services service application because currently on my Portal Farm site does not showingExcel Service Application  in Service Applications List. Am beginner on SharePoint technology.

Please help.