I'm really happy that a lot more people are reading A Song of Ice and Fire. It's my favorite series and now that we have that in common, I can be less
Also, look into The Hedge Knight novella/comic book series about Dunk and Egg. It's a side story that takes place many years before the novel and reading them won't ruin any of the novels, because it takes place in the past. You can "download" them if you know where to look.