I have read lots of books, and here are some horsey one which I recomend.

• The Saddle Club
  (This is a series of 100 books or so, by Bonnie Bryant)
• Jill Books
  (The Jill series has 8 or so books in. By Ruby Ferguson)
• Heatland series
  (20 or so books by Lauren Brooke, quite good)
• My Secret Unicorn
  (Not the best, quite young. At least 20 books)
• A Job With Horses
  (Very good. By Josephine Pullien Thompson)
• Pony Club Secrets
  (Fantastic series. By Stacy Gregg)

• Josephine Pullein Thompson
• Christine Pullein Thompson
• Diana Pullein Thompson
• Enid Blytan
• Lauren Brooke
• Jenny Oldfield
• Ruby Ferguson
• Patricia Leitch
• Stacy Gregg

"Try and figure out your plot first and do a map of the chapters - it will help you when you get started. And think about your characters and what each one is really like so that their actions reflect their personalities."
- Stacy Gregg