You should take multiple copies of all important documents and forms of identification, and keep electronic/scanned files of these for ease of access. You may also want to take a few passport-sized photographs, as you may need these to apply/register for things that you wouldn't need them for at home!
Key questions to consider
- Am I able to fulfil the visa and entry requirements of my host country?
- Is my passport valid for the full length of my planned activity and any additional time, for visa and entry requirement purposes?
- Do I have any medical conditions I will need to manage while away? How will I manage these when far away from family, friends and a healthcare system I am familiar with?
- Is there a formal registration process I need to complete in my host city/country?
- Do I need a residents'/registration number before I can open a bank account?
- Do I need a bank account before I can apply for accommodation?
- How do I matriculate at my host institution?
- What documents do I need to take with me?