What are the immigration officers going to ask or require once I land in Hamburg?

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This is my first time travelling as an adult and alone. I am travelling from Panama. I already checked and I don't need a visa. What are the things that I will need? I will be visiting someone I met online, that's why I will be staying in a hotel for the first 4 days, and then depending on how things works, I will be staying with the person, or I will make another reservation for the time left. He already gave me his address, but I'm not sure if they will ask for something else.
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What do you need to tell the Immigration Department?
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