There's a number of example scripts you may also find helpful. They come bundled with the distributions but you can also read them online (linked from their MANIFEST files): PDF::API2 examples/* and PDF::API2::Simple examples/*. If you dig around in the MANIFESTs, you may find useful snippets in other directories such as t/* and contrib/*.

Until you find the module, if you have a ps and want to convert it to a pdf you can simply cheat and use something like this in your script

system("ps2pdf $ps_input_file -o $pdf_output_file");