Need help writing custom script for Linux admin task

I'm spending a lot of time manually reporting basic Linux system stats that I get from either Cacti monitoring tool and/or Top and ps command.  I'm essentially writing a report in following format below.

I'm pretty sure this could be done in Shell scripting and Cron job, not sure if it would be easier as a Perl script.  Either way I'm open to learning the most efficient and simplest solution for the above admin task.  

Host: <name value>
 
CPU Util: <value> (if Idle % is 100 - 60% print "Good" ; if Idle % is 60 - 30% print "Fair"; if Idle % is 30 - 0% print "Bad")
 
Memory Util: <value> (if Free Mem % is 100 - 60% print "Good" ; if Free Mem % is 60 - 30% print "Fair"; if Free Mem % is 30 - 0% print "Bad")
 
Up since: (check date PID was started;  calculate number of days/hours PID has been runninig; print value)
 
Email Frequency: Select (every 60 mins | every 24 hours )
Format HTML 
Send email to recipients
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