Assuming the yeast is good and it starts fermenting the starter wort I would give it a few days to ferment out completely so you are sure you have a bunch of fresh healthy yeast in there. Then I would put it in the fridge, at least over night, which will cause the bulk of the yeast to drop to the bottom of the growler. I pour off most of the wort from the yeast leaving behind just enough to swirl around and get all the yeast off the bottom of the growler. It then goes into the wort.
Out of curiosity, is the kit a Heady Topper clone? Never heard of VT Ale yeast...if it is a heady topper like beer you may need to step up the starter size to have enough yeast.