Start with the kit lens 14-42mm ( or 14-45mm if you can find it ) and then add at least one prime lens. Either Olympus / Panasonic M4/3 lenses or used Nikon AI-S manual lenses with a M4/3 ---> Nikon adapter. ( I recommend Nikon AI-S mount only because you can use these lenses on almost any type of camera )
The first prime I would buy would be either the Olympus 45mm f/1.8 or a used Nikon 50mm f/1.4 AI-S with a M4/3 adapter.