Visiting S. Korea as a student for holidays

My pleasure writing this to you, i am an Djiboutia student studying in Zhejiang province Ningbo, and i'm about to make a short visit to South Korea for my summer holidays. I wish to ask for the types of documents i need to provide to the embassy and if i need a bank statement together with my application documents, and also the approrate time that is convinient for me to apply as well. Thank you