yes check-up should be hyphenated
"Fired up" is one of those phrases that is hyphenated when it is used as a modifier preceding whatever it is modifying, but not hyphenated when it is used as a predicate adjective. For example, if you say "Everyone was fired up about the new project", "fired up" is a predicate adjective and not hyphenated. However, if you refer to someone's "fired-up speech", "fired-up" is a modifier that precedes "speech" and is therefore hyphenated. Using "fired up" as a predicate adjective is more common.
followup This word spelled as is does not come up on Answers.com spell check. Followup is not hyphenated.
stand-up guy
does write up need a hyphen
yes
Yes, "to-date" is hyphenated when used as an adjective before a noun (e.g. up-to-date information) or as an adverb following a verb (e.g. the report is up to date).
The term mix-up (noun) is usually hyphenated.
It is not hyphenated.
This is one of the most common mistakes make today regarding hyphenation. Editor in chief is not hyphenated, although more and more people seem to be disregarding this rule. If you have a paper dictionary lying around somewhere, look it up. I suspect that as time goes on (and this might be happening even now in the most current editions of dictionaries), the hyphenated version will become an alternate version.
Some examples of hyphenated words beginning with "a" include: anti-inflammatory cross-reference self-esteem up-to-date
Motorcycle is not hyphenated