If you followed these instructions, you would end up with a slightly alcoholic cider as the recipe claims.
If you have a LHBS close by, go ahead and pick up an airlock, this $2 piece would lessen your risk of other bugs playing in your cider.
Since you're wanting a dry, still cider, I would recommend champagne yeast and let it sit for a couple of weeks to get it nice and dry.
As far as a reasonable cider goes, there are many variables that can affect the taste, my recommendation is to just try it out and see what happens.

cheers