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Yes, "я хочу есть хлеб" is correct. :)

Declension? They tell you the relationship between the words. Who does what to whom and how and stuff like that. Very important! [/quote]
Exactly!
Let's take three Russian words: 1) dog (собака),...

Are you talking about examples?

У меня есть ресторан - I have a restaurant.
У меня нет ресторана - I don't have a restaurant.
Мы направились к ресторану - We headed for the restaurant.
за...

Because it's a surname. Russian last (and sometimes first) names are declined in different ways, sometimes similar to nouns, sometimes similar to adjectives. In the instrumental case last names...

Have you heard about declension?
In Russian nouns, adjectives, numerals etc. change their endings, depending on what case and number they are in (sometimes gender also matters).

So "a" that is...