The National Association of Realtors offers real estate business letter templates online. The NAR library receives requests that have motivated their librarians to create downloadable templates. These templates include asking for referrals, changing real estate firms, checking in with past clients and many more useful sample letters.
In addition, Breakthrough Broker provides real estate letter templates and other helpful tools to become a self-motivated and competent real estate agent. Breakthrough Broker recommends reading "Purple Cow" by Seth Godin, "Never Eat Alone" by Keith Ferrazzi and "The Encore Effect" by Mark Sanborn. These books are about business, marketing development and motivation.