There are numerous documents out there about mod_perl, and other technologies such as FastCGI.   Probably even a cookbook.

However, I would observe that “good ol’ CGI” can go a long way when used with a well-tuned server and a judicious mix of dynamic vs. static (cached...) content.   The transition from this environment to other alternatives is not quite a non-trivial task.   I suggest that you consider your existing application very carefully before concluding that it “must” be converted to another form of deployment.   It ain’t necessarily so...