here is some stuff about the difference between ser and estar
http://spanish.about.com/cs/verbs/a/servsestar.htmWhen I think of the differences between ser and estar, I like to think of ser as the passive verb and estar as the active one. (I'm not using the terms in a grammatical sense here.) Ser tells you what something is, the nature of its being, while estar refers more to what something does. I might use soy (the first-person present of ser) to tell you what I am, but I'd use estoy (the first-person present of estar) to tell you what I am being.
Now that's probably as clear as a politician's equivocation, but let me give you a few examples. I might say, "Estoy enfermo." That would tell you that I am being sick, that I am sick at the moment. But it doesn't tell you what I am. Now if I were to say, "Soy enfermo," that would have a different meaning entirely. That would refer to who I am, to the nature of my being. We might translate that as "I am a sick person" or "I am sickly."
Note similar differences in these examples:
Estoy cansado, I am tired. Soy cansado, I am a tired person.
Estoy feliz, I'm happy now. Soy feliz, I am happy by nature.
Está callada, she's being quiet. Es callada, she's introverted.
No soy listo, I'm not a quick thinker. Estoy listo, I'm ready.
I don't speak it either, I can translate some words but those are mostly nouns, I keep procrastinating on verb conjugations.