Hi,
My suggestion is need to know the SAP overview and fundamentals of SAP BASIS(SAP R/3 Security).
Then go for SAP BASIS as his background is not from SAP.
He need to understand the terminology. I mean transaction, authorizations, profile, Roles(Single,Composite, Derived).
Then slowly start the BASIS topics like TMS,Spool Admin, Client Admin, CCMS Monitoring,
Background jobs, Then DB Admin.
Post installation Steps.
Road map to implementation.
Spend at least 1 hour in scn.sap.com to read fourm.