Yes, use hyphens for filenames, and lower case.
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Posts made by Alex-Harford
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RE: When using ALT tags - are spaces, hyphens or underscores preferred by Google when using multiple words?
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RE: How to remove a sub domain from Google Index!
If you have nowhere more appropriate to redirect to I don't see a problem redirecting to the homepage.
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RE: How to remove a sub domain from Google Index!
You could 301 redirect those subdomains to your preferred copy of the content. That way, you'll keep the link juice and Google's index will eventually be updated.
Alternatively, are you registered with Google Webmaster Tools? I've never had to remove a URL but I believe you can do it through that.