Look up 'Les Vogt'. He has about the best program for teaching young aspiring trainers and riders of reiners and cowhorses. He has won 15 World Championships, and is a true 'trainer's trainers' and is a true gentleman. I cannot say enough good things about Les. He is kind to both people and horses and has shown that you do not need to be unethical to win World Championships.
He has a program he calls 'Cowhorse U'. He has a series of people training videos and videos that show the foundation you need in a reining horse. They will help anyone make a better horse. Look up his website and his training videos. Here is a link to his series about getting a good foundation on a horse and beginning maneuver like the 'turn-around'.
Les Vogt CowHorse you Program: Study Program for the Performance Horse by Les Vogt
I think that given the horse and trainer you have available to you, you would be much better served by this video series. You cannot even get started until you know what you don't know about the steps needed to make a horse 'light and responsive' and know how to put the right foundation in one.