Start may have the connotation of being in the future and beginning may more easily be associated with the past. The period will start in 15 minutes. vs I can barely remember the beginning of the period. Start has the sense of being a fixed point in time, while beginning could possibly refer to any time between the start and the halfway point.
The comma looks too accidental and unpolished. So again, the best simple rule-of-thumb is to avoid comma-after-so (indeed comma after any FANBOYS) at the beginning of a sentence, immediately following a semicolon, or immediately following a comma. That will nearly always align you with great writers and editors.
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Are both expressions "At the beginning" "In the beginning" valid and equivalent? The first "seems wrong" to me, but it has more Google results.