Question

how do I begin? to take this course?

Answer 1

watch nthe first lesson. look at the calendar to see the assignment schedule, do the assignments - all at your own pace

http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-00-introduction-to-computer-science-and-programming-fall-2008/index.htm

Answer 2

Any way you like. Do you know some Python?