🚀 go-pugleaf

You should be able to place single page tiff files. Here is the example from the scripting guide:

Rem Place an image
Dim myInDesign As InDesign.Application
Set myInDesign = CreateObject("InDesign.Application.2.0")
Set myWindow = myInDesign.ActiveWindow
Set mySpread = myWindow.ActiveSpread
Rem You must place a common dialog control on
Rem the form containing this Sub to have this work.
CommonDialog1.Filter = "TIFs {*.TIF)|*.TIF"
CommonDialog1.ShowOpen
myFile = CommonDialog1.FileName
Set myImage = mySpread.Place(myFile)

You should look for the guide on your CD:
The Scripting Guide may be found on the Adobe InDesign 2.0 program CD-ROM.

I don't have any suggestions regarding the conversion from mulipage to single page.