I would take out some spells and focus more on the creatures. Knights are fairly aggressive and quick so I don't know that a more control themed card like
Ghostly Prison fits. I would also consider cutting down on the
Brave the Elements and Dawn Charms.
Honor of the pure is good, but I prefer
Light from Within with my knights. I use Thisledown Liege and
Pentarch Paladin which have three mana symbols, but all your creature have two mana symbols, so something to consider.
As for the creatures:
Kinsbaile Cavalier! Dropping that can end the game that turn. He is amazing. If you have Kinsbaile and
Knight Exemplar out, people start sweating. I also agree with previous poster that
Student of Warfare is a fantastic 1st turn drop.