torn in too many directions

For months, I've been contemplating about going back to school, hopefully take up interior designing, which I absolutely learn to love for quite some time now. The problem is, I have the vaguest idea of what interior designing courses to take. I have tried searching for some in the Internet, and I found this: http://www.schoolofinteriordesign.org/interior-design-courses/13/typical
-interior-design-courses/. But I'm not sure which of these I need to prioritize first. Hope you can help me with my dilemma.

Thanks!