So, your library has lots of great things, offers lots of great services, but nobody knows about them. The answer, my friends, is marketing. 
Now, when I say marketing, I don’t just mean advertising (because, if you know anything about marketing, you know that advertising is just one part of marketing!), but that whole discussion about just what marketing includes, is one for another day.
Where to Find Library Marketing Info is a PowerPoint by Kathy Dempsey that lists selected resources to help with library marketing. Please note that it is not exhaustive–but it is a great start. Good luck!
A Life in Libraries 