What you did with TMPGEnc is encode the files. Now you need to Author your DVD. If your .m2v file and .wav file are combined over 4.3GB, it's too big for single layered DVDs, ifi ts over 8.6GB or so, it's too big for dual layered DVDs.
Then you need to Author your DVD, which is where you make menus (if you want any) and make a DVD-Video compliant DVD. Do you have TMPGEnc DVD Author or other such program? (DVD-Lab?) Nero Vision Express will author your DVD too, but I don't think it accepts already DVD compliant video.
If you want a free DVD Authoring program, with no frills (like no menus etc) go with IfoEdit, and multiplex your video and audio, it will make the image for you to burn or burn the DVD for you.
Here's a list of DVD Authoring programs:
http://www.videohelp.com/tools?s=2