Hello Rizwan,
Once you get the SAP Single Sign-On license you can choose between different SSO scenarios: SAML / X.509 / Kerberos/SPNEGO. The Secure Login Server will be necessary only if you decide to use the X.509 client certificates. If you decide to go for SAML, you have to use the SAML Identity Provider. When you choose SAML, you will be able to benefit also from the Mobile SSO solution we offer with the SAP Single Sign-On that is also available for SAP Fiori Client, the native mobile app for Fiori.
Here are the guides but you have to decide firt which technology you want to use for SSO:
Mobile Single Sign-On for SAP Fiori - Step-by-Step Guide
http://help.sap.com/download/sapsso/secure_login_impl_guide_en.pdf
Regards,
Donka Dimitrova