I second the agility trial part, its much more entertaining. Obedience and rally is the same thing over and over again, and while you'll be able to see the huge differences between ready dogs and handlers and dogs and handlers that aren't really that prepared, it will get boring quick. If you have some sort of back ground in obedience/rally you'll kind of be able to tell what the judge is taking points off for, which is nice to know for the future, but other than that don't expect to spend too much time at a show. It usually takes about an hour per class (depending on the show size) and for now I'm guessing novice/beginning novice is the most interesting thing for you since you're just starting out, but the open and utility dogs put on a much bigger show. If you can stick around for all that, then all the power to you, I know I could never make it. I usually stay for dogs that I know in the next level up, but that's about it.