What bus should I ride if Im going to north point from Nathan road Argyle street?

You can walk to Nelson Street Mong Kok/Bank Center, Nathan Road to take the bus No. 102 to Island Place, King’s Road. The you can get to north point within 5 mins walking.

Alternatively, you can walk to the nearby Mong Kok Station to take the Tsuen Wan Line to Admiralty Station, where you can transfer to Island Line to North Point Station.