[Joe Moya] “I would like to convert a 720 x 480 to a 1440 x 720 pixels.”
Create a standard DV project, import the 720×480 footage and then export to 1440×720. Be sure to select the correct pixel aspect ratios when creating the project and when exporting.
You will also find links to many free tutorials in the PremiereProPedia that will quickly show you how things are done in Premiere Pro.
Cheers
Eddie