How to make friends in a foreign country?

So my mom got accepted in the University or Kobehagen , in Denmark. We are moving in August…I am going to do IB, International Baccalaureate. Dad called the school for me and they said they have space for me to get in…but I just have to write them on an A4 page the reason why I want to do IB. I am finishing 10th grade in the end of May or something. I am a shy person and sometimes I have difficulties making friends:(, Do you guys on here have any suggestions?
And also how can I earn some money before I go?

p.s I am 15 years old girl and I don’t speak Danish.