When it comes to video editing I don't think there is any "optimal", "best", or any other kind of "rules", only personal preference and what works for you and your system.
With that said, when I load a program I always put it in the default location. As for the VS working folder, I have an external hard drive that I've named V: (for video). Each project has its own sub-folder: Christmas, Vacation, Baseball Season, etc. When I am working on the Baseball video any and all files related to it go into that particular Baseball folder, including the captured video clips, any titles I make with Xara3D, any backgrounds I make with Digital Juice, any sound clips I might rip from CDs. (Of course you could also make sub-folders for these if you like.) When I finally render my project to a DVD-compliant MPEG-2 that also goes in the folder. When I burn to DVD Folders I choose to burn to the Baseball folder and the Video_TS folder is automatically placed there. When I make my disc label and case insert I save the files to the Baseball folder.
I use Nero to burn instead of VS because many times I am burning multiple copies, sometimes not all at once. If I used VS I would have to go thru the render process all over again. When I use Nero I simply navigate to the Baseball folder and open the Video_TS folder and choose the files. They are already rendered so all that takes place is the actual burning.
I do it this way for housekeeping reasons: If I need to go back and re-edit something everything is in one place, and then when I am finally done I can simply delete the folder if I wish to do so. (Although I usually don't. I do delete all the individual files but keep the final rendered MPEG-2 and the burned project in the project folder.)
Again, this is personal preference and I'm sure you will get other opinions on what is "optimal".
