No need to sand before mist (at least, none of the plasterers I've had in did). Mist, fill, sand, maybe go over any larger filled areas again, paint.
Don't know about vinyl emulsion though.
Edit: Google says no to vinyl for a mist coat.
Google told me that about vinyl too but the tin of vinyl tells me to do a 60:40 mix and I'd bet more diyers mix up vinyl than go and get some contact emlusion. Im guessing it's just internet advice and the advantage in actually minimal.
@dst2 started
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No need to sand before mist (at least, none of the plasterers I've had in did). Mist, fill, sand, maybe go over any larger filled areas again, paint.
Don't know about vinyl emulsion though.
Edit: Google says no to vinyl for a mist coat.