1. I'll have to write a new thread on this in a couple of days. About time, I guess, show how to both add still and video samples.
2. Under VIDEO > COMPRESSION you should select HuffYUV. If it's not already on your system, install it. There's a download in this forum, for convenience,
search for it.
3. Read back to my last post. Right now you have an AVI. It must be converted to DVD-compliant MPEG-2, then authored, then burned as a new ISO (or VIDEO_TS folder) to be put back on DVD. These are all separate processes. Just open new threads, if you need more help. (MPEG under Conversion/Encoding subforum, authoring and burning under Authoring subforum)
I don't recall where your skill set is anymore. I try to communicate at the level of the member, then boost them up as time goes by.