They really don't say crush if I'm not mistaken...
Perhaps 'Me enamoro muchisimo de tu....' (if you did mean 'your')
(if you meant 'you', then 'ti' instead of 'tu', which needs a noun to follow it, of course)
esta ____?
De donde eres? = Where are you from
To ask what someone is like in Spanish, say, "Como eres?"
You have to say: Usted trabaja?
Cuantos anos tienes?
¿Estás triste?
Tienes un novio?
¿Cuál es tu nacionalidad?
¿Qué te gusta hacer?
¿Está / están / estás / estáis casados?
You ask him/her. A Spanish person is one that was born in spain, a hispanic one is one with latin roots.
When you are talking about yourself, you say "Tengo (your age) años."