N Scale Turntable...HELP!

I recently purchased a turntable to be mounted in my n-scale railyard. I would like to motorize it. I think I can find a motor kit for it but need some advice about the following:

HOW do I go about indexing the turntable? Is there an “Indexing” kit available or is that something I must build myself? Please help ! All advise will be appreciated.

What brand of turntable is it? Have you checked the manufacturer’s web site for a motorizing / indexing kit?