For the first half of the book, you simply read, listen, and repeat. You aren't expected to produce your own sentences yet.
: If you only have the PDF, try to find the accompanying audio files. The Norwegian "pitch accent" and melody are difficult to master without hearing native speakers. Note on "Assimil Norwegian" Availability assimil norwegian pdf
By following these tips and using the Assimil Norwegian PDF course, you'll be well on your way to becoming proficient in Norwegian. Happy learning! For the first half of the book, you