salt will start to disolve on its own, but will tank longer. Provided you have a filter and a powerhead running there should be enough current within the tank to keep it a float. 1.023 is fine, but make sure you raise it before you add fish. That much of a difference is no big deal to bacteria.
You might not read ammonia until tomarrow or even the next day. once its there it will start to climb rapidly. Once you reach the maximum amount of the test kit, id say its good to take it out and let it fall naturaly. This should be achieved in 2 weeks if not sooner.