A house after set up
In the context "this setup works great!", it is one word. In the context "I have to set up the table still", it is two words. In the context, "it was a set-up, I am innocent!", it is hyphenated.
yes check-up should be hyphenated
roller skates
"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
The term mix-up (noun) is usually hyphenated.
It is not hyphenated.
Motorcycle is not hyphenated