Do you want a scene selection menu with the mini pictures of the scenes? Or just names? Any way, the first thing you must do is select the movie stream and make chapter points. After that in the menu you can link (just right click the button) whatever buttons you make to the chapter points.
2)
What do you mean with menu cells? Do you mean a motion menu with buttons displaying the different scenes?
Also, there are very handy guides at the dvd-lab site.