If you have no fish and your live rock is cured your not going to be getting much of anything because there is basicly no bioload in the tank.
Once you get some fish inthere it will start producing. Dont expect to have to empty the cup every day or anything like that. With a moderate fish load a cup would expect to fill up once every 3 or 4 days IMO
You can also adjust the collection cup down if you want by rasing the rubber gasket on the collection cup. This will make the skimmer less efficent by having a lighter color skim in the cup but it will give you something to collect. Once you start getting a browner color in the cup rase the collection cup a little at a time until the liquid is a very dark tea color.