I've started writing articles in Pages and would like to have other members write articles. What's the best way to give them permissions so that they can write articles? Can I have them write and see their own hidden articles but not mine, and can I be the only one allowed to unhide the article? 

If your database has categories, you can make use of the following settings which are at the category level - "Set custom permissions" to ON, and "Users can see..." to OFF:

 

And then provide that group of people access to add records in a new category - they can crack on with creating their own articles, you can then move them to a different category once ready to go.

Just for the sake of completeness: the official solution is …

• Turn on “Moderate new records” in the database settings
• Assign an “author group” to the users
• Change the database permissions to allow “add record” for this group

Thanks a lot! My Article database does not use categories, so I'm going to follow @opentype's suggestions.