Question

You're talking to a group of people you've never met before, and you want to be polite

Answer 1

Hmm i assume you mean in spanish right? probably go with "Hola como estas ustedes, mi nombre es (insert name here). however i  recommend waiting for someone a little more knowledgeable as i am from a less fancy part of Mexico and that's just how everyone is "polite" around my home town hope this helps