Moving on to next file after script completes

I am hoping someone can help. I am applescripting/automating a workflow that will print PowerPoint handouts to a CUPS-PDF printer. I can select multiple PPTs, open them, and print the first one properly, but cannot figure out print the rest of the files. My printing code is attached. The rest of the workflow is automator based. I am very new to applescripting, so please use small words and such.

tell application "Microsoft PowerPoint"

set number of copies of print options of active presentation to 1
set collate of print options of active presentation to false
set print color type of print options of active presentation to print black and white
set print hidden slides of print options of active presentation to false
set fit to page of print options of active presentation to true
set frame slides of print options of active presentation to true
set output type of print options of active presentation to print two slide handouts


end tell