That's a diferent question from your inicial question. Now that you have a script that can run another detached from the console, how can you lauch it ?
Run it from the command line (if its a long lived daemon, er process, it will be a fire and forget :-)
use a scheduler command, like an at command on winnt
create a batch file and run the perl script that creates the detached process from there
use the same technique that you would use to run any other detached program ;^)
I've done it with an at command and a batch file that does a "d:\apps\perl\bin\perl.exe d:\dev\perl\rundaemon.pl" (rundaemon.pl is the inicial script).