In the help file, there is a reference called "ActiveX and VBA Reference". In there you will find what you are looking for, but you'll need to use (vlax-get-acad-object), which you'll find under v of the Autolisp reference. If you're in the vlide and you inspect (vlax-get-acad-object), you'll get a list popup with all the properties of the acad database, which is what that is. You can double click on properties in the popup and see what's nested. You use (vla-get-activedocument (vlax-get-acad-object)) to access the drawings object model. Hope that helps you start.