" SCCM 1511 Adding Software Update Point Step by Step PDF" this document will help you to add Software Update Point on Central Administrative Site with all the steps. If you are planning to build SCCM 1511 Central Administrative Site Hierarchy infra stature, then you should have at least one Primary Site Server which will report to Central Administrative Site and for Software Update deployment you should have WSUS installed. Here I have explained step by step installation for WSUS and adding a software Update Point roles on Central Administrative Site for SCCM 1511.
I would to inform that go to my other document which is explained about SCCM 1511 Hierarchy for Central Administrative Site Installation Completely with all other required installations.
Below is article that will have explained new features in SCCM 1511 for Software Updates.