There are many training schools for home inspectors. By completing formal training in home inspection the professional will use a set standard, have experience in various aspects of home inspection, as well as have the theoretical and practical knowledge needed to effectively inspect a home.
Look for a home inspection company or professional that is licensed and has all the required credentialing and certification that are necessary in your area. City or county managers, real estate agents and bank/mortgage companies can provide a list of recognized professions.