Estás bien.
Estoy bien = I'm OK/doing fine etc.
OK, mañana
ok
OK, why?
"Bueno."
¿Cómo estàs ustedes? is how you say "how are you doing everyone?" in spanish.
ok
In English, "ok pero quien era" translates to "ok but who was it."
Estas bien?
No estás bien
"Hello, how are you doing?" in Spanish is "Hola, ¿cómo estás?".
It is Spanish for " what will be " ... OK that is a unsure answer but it is Spanish.