Hi,
Take a look at this post. I think it sheds a lot of light on the subject:
Forcing Silence - “Rumination isn’t something that happens to you; it’s something you do.”
But the whole collection is worth going through, because several of the posts contain ideas that can help you get a better understanding of the internal dialogue and silence.
For example, check this one out:
The Internal Dialogue Is Not Your Thoughts!
Or this one:
It’s really more about where you focus your attention, than merely words in the brain.
I’m a beginner practitioner too. I basically try not to do anything at all. Like a sloth. 
Usually, I have some kind of internal activity going on almost constantly. I just “let it go” whenever I notice that WWE has started up in my head again. All I’m trying to do with these little acts of letting go is create at least a few brief gaps in the otherwise constant internal activity.
Again and again, I notice it; again and again, I let it go.
I guess this is probably the only way to do it — forcing silence, as Dan often puts it.
The practice has also given me some firsthand experience of just how annoying the internal dialogue is. It really is a construct that has been foisted upon us from the outside.