Using airspace
It is illegal to take off or land an aircraft(s) on land other than an airport. If you wish to do so anyway, you should apply for an exemption from the province.
Flying a drone
Because of safety concerns, you are not allowed to fly a drone everywhere. For example, in areas around airports, it is prohibited. You may, however, fly in the free airspace. This part is not controlled by air traffic control. On the website of the Rijksoverheid you can find the rules for flying a drone.
Balloons
You usually need permission if you want to launch a balloon or balloons near an airfield. This also applies to glider airfields. Permission may be denied if air traffic may be disrupted. For example, if the wind direction affects the balloons' flight.