If you want to draw horses then I can recommend this book. It really is just about drawing—no words are required so there are none. There is a brief introduction to using the book and further tips, but after that it is up to you.

Just like How To Draw Birds In Simple Steps  (also reviewed on this site) I was impressed with the beautiful simplicity of this slender book, reminding me irresistibly of the old Walter Foster series I learnt to draw from. This breaks the horse down into some basic shapes, and then adds the details in two or more drawings. Every new stage shows the next part in color, and finally there is a pencil drawing and a colored study of the subject. There is a large range of horse poses to choose from including headshots, galloping, rolling, rearing, jumping, etc. to go with a good range of horse breeds, from the Przewalski to the Lipizzaner, Exmoor Pony to Bay Arab, and everything in between. Another one intended for my keeper shelf, and at under £5 (0r $10) inexpensive and very useful.

If you cannot find a good range of drawing and painting materials locally try  SearchPress.com for a list of suppliers. Also in this series and newly available is How To Draw Fairies in Simple Steps by Paul Bryn Davies (Amazon US || UK).