Re:- Time Management

Please start by looking at the documentation available at

http://help.sap.com/

and

http://wiki.scn.sap.com/wiki/display/ERPHCM/ERP+Human+Capital+Management

Also do a little search as there are lots of documentation available online, but you will also need to know how your company (or client) manages time (positive time, negative time, external system, etc.)

P.S. : You can also get some useful litterature through  https://www.sap-press.com/