putting dvd onto macbook pro then burning onto a blank dvd

Hello
Im a bit stuck I hope you can help me
I am trying to burn a home made wedding film DVD so I have two copies but the DVD is not in a movie format and has seperate audio and video files.

Could you please provide me with a step by step idiots guide to solve my problem
Thank You

This should work nicely,
How to copy previously-burned DVD-R video discs

6. Click the Create button. After the image has been created you should see it in the disk listing in the Disk Utility window.

Click to expand...

Regarding the above in McYukon's link, in my experience, you may have to find the image that you have just created in Finder and then drag and drop it into Disk Utility.