Several years ago, Thabiti Anyabwile wrote a book titled, What is a Healthy Church Member?. It still rates as one of the more helpful and practical books I have read on the subject of what it means to be a vital part of a local church.
A few years before the book was published, Thabiti wrote a series of articles on the 9Marks website which eventually became the book. You can still read a few of them to get a taste before buying the book and reading the whole lot.
1st Mark of a Healthy Church MEMBER: Expositional LISTENING
2nd Mark of a Healthy Church MEMBER: Biblical THEOLOGIAN