Dual Layers disks are everywhere.
These are the only programs to use for the newbies, and forget everything else.
Dual Layer Burning
DvD Decrypter,Imgburn with AnyDvD
Single Layer Burning
CloneDvD with AnyDvD
DvD Shrink,Nero with AnyDvD
There are other options to use but you must learn the basics first.