I haven't brewed a Gluten Free Beer, but tasted some really great ones - particularly from the Alchemist in Waterbury, VT. I just wrote an article about GF Beer for Zymurgy Magazine - due to be published around June/July 2012. Several recipes along with it - tried and true, highly recommended ones!
It seems to work best if you work with the natural tartness of the sorghum. You know, Belgian Yeast, tart fruit added, or assertive hops.
Being a beginner, you have an advantage - you'll learn from the start. LOL!