Yep, you'll need an ammonia source. You can throw in a piece of raw shrimp or fish, something like that and let it rot. You'll need ammonia to get up to 4ppm, then it'll drop an nitrites will rise and then they'll both drop to 0 and nitrates will be high. Then do a PWC
to get nitrates down, and then you can add fish. Good luck. You're already part way there with ammonia at 2 ppm
. You could also use ammonia in a bottle (but only the kind that doesn't bubble when you shake it) and dose the tank up to 4ppm. This route is a little faster cuz you don't have to wait for the food to rot and produce ammonia. But be aware that it takes VERY small amount to get to 4ppm.