nothing. it's a 'crutch' word - one that you use to fill a space when you're thinking of something interesting to say.
No tiene significado, unicamente se utiliza como introducciones de frases. En castellano estas palabras se conocen como "muletas"
Gracias. Oswill i couldnt understand all you wrote just a little!:p

So stephen, sort of like "eeer" in ingles?

As in, "eeer i'd like a beer please"
pues / entonces = well/so/therefore etc can all be used in similar context at start of sentence