An eye for detail, spatial awareness, and an understanding of how design harmonizes with the environment will make you a good candidate for a course in interior designing.
Where architecture deals with the planning, designing, and execution of structures, interior design concerns itself with what makes a structure habitable, aesthetically pleasing and comfortable. You, as a potential student, will have to pick a subject you're interested in and are good at. And to make a living off it, you need to undertake a professional interior designing course.
Whichever course you choose, there are certain elements it must offer so that you not only pick up theoretical knowledge but working skills as well.
• Practical: Practical experience is invaluable as you put into practice what you've learnt and see how a project comes together. A course should have at least three months of practical studies, more if possible.
• Knowledge of Materials: Clients you work for in the future will have different tastes and requirements. As such, choose a course that educates on different building materials.
• Use Latest software: Computer-aided Design or CAD is standard software used in the discipline in addition to others so make sure the course has it as part of the syllabi.
• Bachelor's programs: Associate degree programs are typically two years, a little under bachelor's degree courses which are for four years. Associate programs prepare you for entry-level jobs like a designer's assistant while bachelor's programs will prep you to become registered designers.
• Online or 'offline': Online courses are great for working students who can't attend regular classes. 'Offline' courses have the benefit of allowing students and teachers to communicate directly so if there are questions or clarifications you need, they'll be answered on the spot.