1) i don't know..i'm doing graphics when i got no homework (i'm still a secondary student)
2) i don't know either..

3) if you wanna do webgraphics(websites) - photoshop(graphics), xhtml, css and sometimes php too.
for print artwork (banner/ads,etc2) - illustrator, photoshop..

for those who want to be a designer..make sure you have super great pc specs.. and take good care of your computer.. clients doesn't really care what happens to you or your pc.. they want the designs before the deadlines...