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The plural of kick-off is kick-offs.
The kick off is neither direct nor indirect, they are three different restarts. A goal may be scored from a kick off.
Kick off Specialist
Kick off.
Kick off (verb phrase) -- the game kicks off at 1:00. Kickoff (noun) -- the kickoff resulted in a touchback.
You do not need to hyphenate.
You do not hyphenate the number.
You hyphenate it only at the hyphen.
Don't hyphenate; ongoing is one word.
You would hyphenate "thank you" when it is used as an adjective before a noun, such as in "a thank-you card."
I think it's more accepted to hyphenate it.