I cycled my tank using Tetra SafeStart Plus, which adds all the necessary bacteria immediately (they just need time to start their colony, it can be faster but it's not immediate). The bottle has very little in the way of instructions so if you'd like I can link a site I found very helpful.
Otherwise, your source of ammonia can be chemical or you can just add fish food and let it decay. You'll need a test kit in either case (API master test kit widely recommended) to monitor your levels and know when it's safe. Plenty of seasoned fish keepers can help you with the step-by-steps!