How can I go from the airport to Manhattan?

Drive. Bus.

By bus.... Norwegian have some cooperation with a bus Company... Rental car, taxi... Or take taxi to nearby train station along the Hudson river and take. Train from there... The woodburyvoitlets which is closeby (15 minutes) also have a bus service to Manhattan

There is a shuttle bus to port authority bus terminal in the center of Manhattan and you can get the subway to most parts of NYC there.