DVD movie editing

I am in need of info on how to edit a DVD movie I just transfered a video tape I shot to DVD and now I need to edit it, I never did it before and I want to know If i need to transfer the dvd to my hard drive to edit and how do I go about doing this,and what is the best software to do simple editing of this dvd I did,
Please send the info to my e mail address
Thank you