Hi Robert - you can do this in several different ways. One easy way is to look in the outline view window and click on the track icon, dragging it over to the menu editor window. Hold it a moment for the contextual dialog box to appear, and select the option that creates a chapter index. You will then need to choose a theme from the DVDSP set, and the entire chapter index system gets created for you, including links between menus if more than one gets created.
Alternatively, you can draw out the buttons yourself and manually connect them one by one, but for what you are doing the automated way makes most sense, IMO.
Good luck!