Your questions are valid, but pretty school specific. As you do your search here (google search including Greekchat is more productive than the internal GC search engine), also look for your school in particular. If you don't find your school, look for a school of similar size and culture in your part of the world. It may not be exact but should give you some ideas about what to do and how to behave. But in short - ALWAYS be nice, be extra aware of your appearance, be graceful, limit alcohol and sexual behavior and get involved in clubs, activities, intramurals, etc. And do all of this while keeping pristine grades

That's a lot, but your first semester freshman year is a whirlwind no matter what. Use your calendar and if you aren't already a good time manager, learn how to quickly.