Corporación de Radio y Televisión Española
State-owned public corporation that assumed the indirect management of the Spanish public radio and television ...
Well, that's three questions actually. Let me begin with the third and last one: in short, no, it's not weird to speak Spanish with voseo, and it won't hinder communication with other Spanish speakers....
The basic answer would be the same, even if you were a beginner.
You may, indeed, strike up a conversation with a random stranger in the US.
Sí, puedes entablar conversación con un desconocido ...
If you want to practice your Spanish writing you could do so on r/WriteStreakES
WriteStreakES is a community where you can write a short text every day and native speakers will correct it for ...