Research the culture and history of the places you will be serving and practice the language.
Be intentional about getting to know people, you are with the other staff constantly and you only have a week with the groups coming in, so make the most of it.
Even if it means getting up earlier, make sure you have time by yourself every day to spend reading scripture and praying, there's no way to get through these long days apart from God, you need to be filled by Him.
Go with the flow, plans can change on the fly- learn to be okay with improvising and leading, even when you don't fully know the answers yourself.
Be vulnerable, people trust you more as a leader when they see you being honest and open about things.