"Something is scheduled starting AS OF tomorrow". Is this the correct usage? I do not like the sound of it. What would a native speaker use in this situation?
Something is scheduled starting AS OF tomorrow
Is an odd one to say, normally you are more specific with your words, for example you would say "starting as of 3pm" but tomorrow is very vague. It is however, still valid.
"starting as of" is normally used to specifically schedule, to say something starts tomorrow you normally just say "it is tomorrow" or "it starts tomorrow" or even "it will start tomorrow".
Sometimes "starting as of" is used to convey an emotion of drama. A good example of this is a competition.
Is the same as saying:
As of tomorrow something will have started
As of is a correct expression, has a temporal meaning and expresses the date (time) when an event starts or ends.
In your context there’s no ambiguity, as the words “starting” and “tomorrow” are used.