Hi, Education.com has an information center on boarding schools that covers how a boarding school is different than other schools, the benefits of boarding schools, and how to apply to one: http://www.education.com/topic/private-boarding-schools/
Unfortunately, I don't have any personal experiences to share in this regard.
I am including below some additional resources that you may find helpful for this grade.
I work with The Association of Boarding Schools (TABS for short), a non-profit with more than 300 member schools in both North America and abroad. I read your post about boarding school for a 1st grader and thought you might be interested in checking out TABS at www.boardingschools.com.
One of the best ways to check out different boarding schools is to use TABS School Browser. You can enter the school name if you have a particular school in mind, or search by zip code, and even view an A-Z listing of nearly 300 member schools. Each school has its own page and profile with lots of key information, and you can request info from multiple schools at once. It’s quite the time-saver!
Also, the TABS Guided Search tool lets you refine your search even more. You can search by gender, specialty, grade levels, and location. You can even add more targeted criteria including courses, arts, and athletic interests. It’s perfect for those who know what they want—and helps those who don’t to figure it out.
Almost all boarding schools cost good money to attend, even if they are public institutions. Tuition includes education payments, meal plan, lodging and essential materials including toothpaste, toilet paper and soap. Parents can often sign up for a monthly, multi-monthly or yearly payment plan. There are some exceptions for parents or guardians who meet school's financial aid requirements. They usually are provided with a partial or full scholarship. In case they are refused in this service, parents can apply for cash loans to cover basic payments.