As far as I know most of the informaiton you're looking for is not avialable to the public. However, according to ZenithOptimedia (2006), overall advertising expenditure in the Netherlands in 2005 was €3.7bn. (see here)
The radio market share was 7.7% in 2001 (see here) and the tv market share was 37.2%.
Main radio stations: Radio 538, Radio 2, Sky Radio. See here.
Hope this helps.
