The "send an email" bit is simple: use MIME::Lite. There are plenty of samples in the docs that will get you going in short order.

For the rest of it you need to do a little study. Take a stroll around the Tutorials section here and find out about Input and Output, although you may be better off starting with Getting Started with Perl.

To find out if something has been answered in another thread you should use Super Search. For example a super search on log file turns up Extracting useful information from Windows Event Logs and Search a file with ids from another file which may help a little.

Best thing is to write some code then run it by us for comment. We are generally much happier criticizing code for you than writing it in the first place. ;)