I often feel as though I may be coming across rude when ordering in Spanish.
In English I would say something like:
1) Could I have a coffee please?
2) Can I have a coffee please?
3) I'll have a coffee please.
But I would never say "I want a coffee please."
Whereas I've read that it is appropriate in Spanish to say "Quiero un café por favor."
What would be the best way to say things like this in Spanish in an informal/casual setting?