I believe that once the coding gets mature, the documentation, tutorials and demos will be a must for the first release. I'm sure others will like this idea and want to help, maybe make a few simple demos. Documentation should be easy to read and follow. Keep it as simple as the library to use, yet detailed enough so that they understand all the aspects of your library. This of course will take time. More time than it will take to make the library it's self I'm sure.