Hmm, you need to find another breeder to mentor you then. I know I'm beating a dead horse but you'll find it very very hard to go anywhere without the help of your mentor. Instead of getting a blow-by-blow account of how to gait, how to stack, what are your dog's faults, what are his strong points, which judges will like you, which ones don't like your dog's type, etc., you're going to have to go through the painstaking process of learning by trial-and-error. It's just best to find a mentor, any mentor! =)

The blocks Redyre showed you are commercially available as Happy Legs:
http://happylegs.com/

IMO, stacking blocks are the most surefire way to train a dog to hold a correct stack (it's all muscle memory, really), but clicker training will train a dog that much faster. If I were you, I'd use a combo of happy legs, clickers, and have somebody more experienced watch you!! When you're focusing on placing your dog's feet in the proper position, you sometimes forget about their topline, or their neck, or their head/expression, or their front is skewed, etc.

And for a cheapie version of happy legs, just use cement blocks:


or bricks:


Constant vigilance and honest critique gives you the best stack =) I can find a million things wrong with my dogs' stack (even though they don't conform to their standards), and it all lies in my incorrect handling. For example, Ivy's front feet are too far out. Her head needs to be brought in more and my lead needs to be higher up. When you start working on your pup's stack, be sure to show us and your showdog friends/mentor. Critique will create perfection