What was your initial dose if ammonia at?
The best way to kick start your cycle is to put some filter media from an established filter into your filter. Perhaps you have a friend who keeps fish who could let you have some? Another option is bottled bacteria such as Dr Tims One and Only. Increasing water temperature also helps, 28 to 30c (83 to 87f) is optimum. Apart from that its a waiting game, but you are only a couple of weeks in.
Have you considered a fish in cycle if you are struggling to get your cycle started?