While what you are looking for can be done, when you finish what you will be doing is reinventing the relational database. Rather than continue down this path I would suggest installing MySQL and learning how to use it instead. It will take less time to learn, and when you are done you will have a more robust and flexible solution, which scales better.

Depending on your needs you might like to start instead with the DBD::CSV driver for DBI. That way you don't have to install a database first (though I strongly recommend doing so for the performance, scalability, ability to handle concurrent connections, etc).