What type of texture is it? Is it something that may work better as a pattern?

Basically the creation of a brush is pretty straight forward (in ver7...) you simple make your texture and select the portion you wish to use as a brush, and then go to Edit --> Define Brush. Give your brush a name it will show up in the brush palette.

there are a few other things regarding libraries but we can talk about that later...

:)
retrocity