How would you introduce yourself with both names in English? I am not familiar with Chinese names, so that makes it harder to answer this question. You could say something like: "Ik heet Julia, en mijn Chinese naam is Hong Yumiao."

Hi / Hello -> Hallo How are you? -> Hoe gaat het met jou / u? (polite) I'm Julie and my Chinese name is Hong Yumiao -> Ik ben / heet Julia en mijn Chinese naam is Hong Yumiao. I'm ## years old -> Ik ben ## jaar. I'm a student -> Ik ben student. And you? -> En jij / u?