2 things:

1) You should use yeast nutrient--just follow the directions on the
package.

2) If you are re-hydrating before you pitch, it should not take more
than about 24 to 36 hours for foaming to occur...one way to find out if
your fermentation is going is to use an airlock on your primary
fermentor at first--if there is bubbling through the airlock, it's
going so give it some more time...