Ok i will try to do a step by step for you. I will presume you have no mature media to add. (media being the sponges, rings etc in your filter).
1. Fill your tank with DECHLORINATED water or add dechlorinator to the tank if you have not already done so. I recomend seachem prime.
2 Turn on your heater & filter. Turn the heater up to 29c or abouts, this will help the bacteria grow.
3. Dose the tank with enough ammonia to bring it up to 5ppm (parts per million)Use our
Calculator to determine the correct dose amount for your size of tank.
4. wait 20 mins or so then test for Ammonia only to see if the doseage was correct. eg 5ppm
5. Test for ammonia only every 24 hours (you will not have to redose yet) untill you see the ammonia start to drop. This can take one or even two weeks.
6. When you see Ammonia drop to around 2ppm do a test for nitrItes there should be some present (NitrItes are the waste product of the A-bacs).
7. When the Ammonia drops to zero that is the end of phase one of the cycle.
8. Now we enter phase 2. Redose to 5ppm ammonia & test for Ammonia & NitrItes daily.
I will leave it there as that is enough to get your head around at this early stage. it seems complicated but the friendly people on here will always be willing to help.
~Tom~