One of the great things about CPAN is that it provides a lot of the code for you. Find the module that you think you need (perhaps CGI::Cookie), if you have questions about how to use it that either aren't in its documentation, or aren't clearly explained, ask again here and we'll be glad to help.
Update: Added module link
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Want more info? How to link
or How to display code and escape characters
are good places to start.