To get them to like the lead - you have to practice, practice, practice. You can also use liver bait as a reward, if you like. Never pull on the lead or jerk it. When they are young, I place the lead on then, drop my end of the lead and let them just get use to the weight and feel of the lead. Just make sure you are there to watch the lead and make sure it does not get caught. I only use it this way when practicing to walk next to me. From there you can pick up your end and practice walking.
Tail will come up once they feel comfortable and that is if he does lift his tail up when not on the lead.
There are confirmation classes offered often by your all-breed and speciality clubs.
Do you know the different types of shapes judges will have you walk your dog in the ring - triangle, straight up and back, etc.. Get a book that will tell you all this. Do you know what to do once in the ring and when you have to go back in if you have won your class? Make sure you do.
Stacking - practice, practice, and practice. Make it an enjoyable task for them. Never jerk them or yell at them. They do make stacking stands, so that they will learn feet positions and after awhile - they will automatically do it themselves. You can reward them, I would, with praise and bait if you like.
And then there are some dogs that hate to do ring stuff. And no matter how long you practice or make it enjoyable for them - they won't do it right ever. I had a gorgeous male - perfect coat, texture, color, gait, bite, etc... Well, he hated the ring. He was a shy dog and didn't like to be in the ring. It spooked him - all the sounds and people. I kept entering him in, thinking he would get use to it, but never did. I finally just stopped and just kept him at home. One person here - I think wnalegria, said that attitude is half of it - to get them to show and win those points. She is right!
Remember, there is not that perfect yorkie or dog. They all have their faults and your job is to know what they are as well as their best features and allow their best features to show more than the faults. I would never dye my dog or tie their ears up, but you know what I mean.
Best of luck!
T.