You can bring clothes in your luggage. It will be hot when you get here, but it gets cold in the winter, so you will need to bring clothes for both. If you need to buy winter clothes, you can buy some here too.
When you get here it will be 90-100 degrees farenheit (32-37 Celcius) and in the winter and can get as cold as -6 Celcius, but is not usually that cold.
The school does not have a uniform. You can wear whatever you want, the only rules are not really short shorts or no tank tops