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How many ppm ammonia are you dosing?
I would not add fish until ammonia and nitrite are being converted to 0 ppm levels within 24 hours of dosing for 3 days straight.
Then do a large PWC to get the nitrate levels down before adding any fish.
The longer you mature your tank the better really. Being patient is hard but it will be rewarded.
I have cycled a few tanks in the past, and I have NEVER had a nitrite reading. When ammonia is zero, nitrite is zero and nitrate is RISING (EG test 10ppm one test and 20ppm next test) you are done.