You are going to need an NLE editing program that can edit mpeg2 files insert your mini dvd in pc right click on the dvd icon in my computer click on explore then click on on the files on dvd and drag the files to your desktop put them in a folder that you know its location ,Then you can import them to your editing software this link can lead you to some tools& editing programs also answer your questions
www.videohelp.com/ .Or down load a free trial or buy sony vegas editng program it can edit the mpeg2 files good luck