I will try to do a better job, henceforth, now that I know the proper technique.
It depends on whether the statement is a complete sentence or not. If the quoted statement is a complete sentence, you would use a period. If the quoted statement is within a larger sentence, you would use a comma.
she lost her virtue in the city.
Plato is a name, so you use it in a manner consistent with how you would use any other name. As in, "Plato wrote a sentence."
Laurel was well aware that Jason had betrayed her, and she confronted him over his perfity. She used the term based on their being engaged in a war game.
She sat by the lake to contemplate her future.
We are short of water, and henceforth cannot go on.
Henceforth there is laid up for me a crown of righteousness, which the Lord, the righteous judge, shall give me at the day of judgement.
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"Henceforward your title is acting manager." (meaning henceforth, from now on, from this point onward)
I'm not familiar with that term.
Someone uses the word 'term' in a sentence as a synonym for word. For example, Shogun is a term for a military commander of Japan.
Yes
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Henceforth was created in 1993.
The Sphynx is an Egytian monument.
Example sentence - His physical features were difficult to explain.