Mac FAVOUR Needed Urgently [!]

Alright well tommrow is my first day at uni, anyway we use Mac G5’s there, I havnt used a mac since like grade 5, which was years & years ago.

Anyway would someone be able to take a screenshot or something to quickly explain the basics, of how to open a program etc, I dont want to goto class looking like I know nothing :-/:h:

P.S – Before someone says it, I did search Google first, but found nothing!!