One of the purposes of a comma is to indicate where there is a slight pause in speaking or a small break in the flow of a sentence. If you read a sentence in a natural way, it will be clear where to put commas. Well then - usually spoken in one cadence with no break: Well then, since we have all agreed, let's go.
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AlpheccaStarsusually spoken in one cadence with no breakI thought this might be the case, but confirmation is always helpful.