Start learning Spanish — book regular classes or a structured course (a local academy, an online tutor, or an intensive once you arrive). It makes daily life far easier, and builds the foundation if you later pursue citizenship.

This is Get Camino's advice, not a legal requirement: the sooner you start building real Spanish, the smoother everything else goes — the padrón clerk, the doctor, your neighbours, the lease you're signing. Formal classes, a private tutor, or an intensive once you land all work; what matters is starting before you need it. And if citizenship is ever on your horizon, the language level you'll need to certify is far easier to reach once you've been at it for a while.