Whatever direction you are moving, that foot is the one you want to move first.
It isn't entirely clear what you are trying to do... but this is something I often do to slip and counter a jab.
I slip outside, while simultaneously taking a small step forward and to the outside with my front foot, and throwing a counter jab to the opponent's stomach. This really catches a lot of people off guard, and it's easy to follow up with a cross or hook.
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