Stinky Tank/No Fish!!

Question
Thank you so much!! My daughter will appreicate it. Should I let the tank cycle for 24-48hrs before adding fish just as I did with the tap water once I change the tank over to the bottle water and purchase the friendly bacteria? By the way I have a beta in a 3.5 gal tank the ammonia levels seem to be ok but I am very nerveous. How do I change his water to the bottle water without putting him into shock? Once again thanks so much I was feeling really lost.
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Followup To  

Answer
Hi again, The Cycle will tell you on the label how long to let it sit. I think you can use it right away, or within a couple hours.
If the beta ain't broke, don't fix it. Just use bottled water whenever you do a water change. My web page expalains how to change the water. Main thing is to only change 10 - 20 percent and keep the temperature steady. It's easier in the summer when most climates you don't need a heater. If the tank is room temperature and the bottled water is the same temperature, no problem.
Usually, winter is when you have to worry about water temperature.
http://steamboats.com/aquarium.html
Write back if you want to discuss further down the line.
-Nori