Welcome to the community.
Your Beneficial Bacteria aka BB, develops mostly in the filter material, not in the water specifically.
Please check out our Article section ond in my signature is a link to the articles including one about "fish in" (the tank) cycling.
You can post your questions in Getting Started Freshwater section and get more direct help.
Freshwater & Brackish - Getting Started - Aquarium Advice - Aquarium Forum Community
Good luck and enjoy learning here!