As with any career that requires creativity the best chance to get a job easily in the world of interior design is to be very good at what you do. Have a portfolio including plenty of references and testimonials and advertise to get your name out there.
you don't have to but it is hard to get hired without experience or a degree
There are many graduate schools that offer interior design. It is hard to give a list without knowing more about what you are looking for in a graduate school. Try a website like gradschools.com and search for interior design. From there, you can choose a location and see the graduate schools in that area that offer interior design. There are actually hundreds of graduate programs in interior design. Here's a good resource to find one near you : http://www.gradschools.com/Subject/Interior-and-Environmental-Design/95.html
Some classic books about interior design are The Better Homes and Garden books. These interior design books have been around for a long time. Another good Interior Design Book is Home by Design.
Interior design
You go to a college that offers a degree in interior design.
I bet Interior Design Institute is a scam.
Classes on Fine Art, 3D Designs and Interior Architecture are important for interior designing.
An online site that specializes in interior design software is www.homedesignersoftware.com/interior/. After you figure out how you want to design, then you can go to Home Depot to buy your supplies.
The Savannah College of Art and Design (SCAD) has a highly rated interior design program. Visit: www.scad.edu/interior-design The University of South Carolina offers a major in interior design: www.sc.edu/career/la/art.html
ITT offers a class in interior design
The Society of British Interior Design was created in 2009.
If you mean interior design, then yes.