You need to get a flea killer/repellant. A flea collar will keep the fleas from getting on him, but will do nothing for the ones already on him and the eggs that have been laid. Frontline or Advantage will kill the bugs and the eggs. With the collar, you are just chasing them off of him and on to you and the area.
Beautiful - or should I say HANDSOME - boy. Thank you for bringing him in and loving him. From the pictures, he is happy already. He will never forget what you have done for him and will pay you back daily.