Do you have an amonia source in the tank to cycle it yet? If not, go grab a few raw, unseasoned shrimp from your local grocery store, stick them in a zip-loc (or different brand) bag, poke holes in the bag, and toss the bag into the tank. Guideline is one shrimp per 30 gallons of water. The amount of time all depends on the tank, could be a week, or it could be a month, maybe even longer. Grab a liquid test kit containing amonia, nitrAte, and nitrIte tests. Test the water until you see the amonia rise, fall, then nitrite rise and fall, then see nitrates rise with amonia and nitrite at 0. After this you would want to do a water change of 25%-50%, then wait a day or two for things to stabilize, then you can add fish. I would wait about a month before adding any clean up crew members to avoid them starving to death, add them slowly. Welcome to AA! I hope this helps. Any confusion, feel free to ask, I probably did a poor job wording this post.