You wouldn't need to add the ammonia if you used bottle bacteria. From my reading,
FritzZyme Turbo Start 900 is the best starter bacteria. If you cant get your hands on that, bio spira or fritz zyme 7 or dr tims can be used but they take a little longer. I would add your fish back in slowly starting with the clowns.
However, the two livestock that make me nervous about doing this are the mandarin and the anemone.
1. Does your mandarin eat frozen foods? Typically, if the mandarin doesn't eat prepared foods, it requires a heavy population of pods to constantly feed off of, which comes with an established tank. Or you would have to purchase and dose pods until the tank becomes more established.
2. The anemone, they can be tricky because they need stability and a "new tank" takes time to achieve if you are starting with "dry riock".
*If you aren't particularly attached to them, you could re-home them if you don't want to risk a casualty.
If you do a complete restart, I would also consider starting with new live sand or at least take yours out and rinse it really good several times. A lot of nutrients could be built up in the sand bed. ***** do not disturb the sand bed until you have removed your inhabitants to another holding tank. If it hasn't been disturbed for a long time, doing so, can cause an ammonia spike.