Moving from a small town to a big City?

I am 15 years old, and me and my family are about to move from a small town of about 5,000 people, to the capitol city of my province (Victoria). The school I go to now has about 400 kids and the school I will be going to in Victoria has 900 students. I was just wondering what is a big city high school like compared to a small town high school? What do they wear to school (how fancy) what are there general attitudes etc.