Though the article is written for an older Civic, this will give you an idea of whats involved.
http://www.lowridereuroweb.com/tech/0301lre_airtech/
Im not sure how much luck youll have finding an air ride kit for a newer civic. Since the suspension in the 7th Gen has changed from what it use to be in the 6th Gen. Do a search on google, youll probably find a lot more of links for companies that have air ride kits. You will probably want to call them to see if they are available for newer civics yet.