Some good articles to get you started:

Ten Commandments of Running a Successful Martial Arts Business

http://www.fightingarts.com/reading/article.php?id=507

Are You Spending Your Martial Arts Ad Dollars Wisely?

http://www.fightingarts.com/reading/article.php?id=37

Why Students Quit

http://www.fightingarts.com/reading/article.php?id=36

Spotless Marketing

http://www.fightingarts.com/reading/article.php?id=492

Creating A Business Plan

http://www.fightingarts.com/reading/article.php?id=34

Boosting Your Martial Arts School’s Income With Merchandise Sales

http://www.fightingarts.com/reading/article.php?id=330

Budo and Business....Dispelling A Myth

http://www.fightingarts.com/reading/article.php?id=33
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"In case you ever wondered what it's like to be knocked out, it's like waking up from a nightmare only to discover it wasn't a dream." -Forrest Griffin