my question is what is a thesis statement, and what is the main point?
what's a supporting detail? what is a sub-details? because i have this
outline and thesis statement to do in my class.

You'd do well to ask your instructor for his or her guidelines on
these matters. There is no single, ironclad definition of the terms
you mention; by finding out exactly what the instructor means by these
terms, you'll be a step closer to producing something that meets the
instructor's standards.