1) See previous ask
2) I started doodling stick figures in 4th grade or so which was late 1999/early 2000. However, I started seriously putting effort into my art around the end of Junior High school, which was 2003 I think?
3) One in high school, and two in college. However, the only one that was of any benefit was the life drawing class I took as an elective one semester in college.
4) See previous ask