Clothing to bring for my trip?

Alright so I will be going to Germany for summer break (in August) and I will be staying at my grandmother's house. I am wondering what I should bring, like what type of clothing (ex: 3 shorts and cami top....) I should bring! I am trying to look cute. Also I an going to get a haircut so what should I get?! I will be flying on my own (I'm 13) from Canada to Germany so what should I wear to the airport (keep in mind it's an 8 hour flight so not a mini skirt and super tight top.) Thank you so much!