Yes doing a water change to bring it down to around 4ppm would be a good start. Don't be adding anymore ammonia until it hits 0. Once it hits 0ppm, you should start seeing nitrites, and they will be off the charts (5+ppm). Once this happens, only add 1ppm of ammonia (whenever ammonia hits 0) until nitrites hit 0ppm, this can take upwards of 2-3 weeks so be patient. Once you start seeing 0 nitrites, you can dose ammonia back up to 4ppm. Then once your tank is processing that ammonia/nitrite within a 12 hour period (double 0's) you are cycled. But make to test the 12 hour period for a week to ensure you are fully cycled.
Hope that helps, if not feel free to PM me and i'll go more in-depth with it
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Who would have thought that plants like dirt?!