In informal writing, such as a text message or casual email, it is acceptable to use a comma at the end of a sentence in a dialog to indicate a pause or trailing off. However, in formal writing, like academic papers or professional correspondence, it is not standard practice to end a sentence in a dialog with a comma.
never
No is not acceptable to leave subject space blank
its the that dialogue is set up one person is talking to another
Yes, you indent each new paragraph.
Yes, of course you can "take quotes" from writing other than dialogue.
No. It is informal shorthand, not acceptable in formal writing.
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In a script, the screenwriter gives characters dialog to speak.The script writer notes a character's name, which sits on a line by itself, and under that, the words that the character speaks.Example:ADAMI can't get the cap off this bottle! Please help me.Proper formatting is always required, depending on the medium for which you're writing the script.
A colon. In colloquial writing a dash (--) may be used, but this is not acceptable in formal writing.
260 ml is a perfectly acceptable way of writing it.
Yes, but it is more likely to be read incorrectly.