Need help in UNIX Shell Scripting

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http://www.unix.com – Requirement is :- 1. there will be daily monthly and on demad flat files coming in SourceDir folder in unix. I want that if daily files are copied in the folder then my script shd check that if files are copied and are correct then process to load files trigger otherwise send a mail to support team with proper msg. eg 2 flat files and 1 contrl file needs to be copied at loaction SorceDir for daily load. flat files will contain data and named like ZIP_ORG_UNIT_YYYYMMDD.TXT and INDIVIDUAL_ORG_UNIT_YYYYMMDD.TXT and 1 control file which contains both the flat file names and count like:- Dail (HowTos)