As far as I remember, and if you mean professionally, then the dwarves were miners. You know, Hi-ho, hi-ho off to work we go, with a pick-axe on my shoulder etc. Otherwise, all they did was lust after Snow White, and plot ways to out-do each other and get first crack on the full-size aryan chick.
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The seven dwarfs gave snow white a place to stay and protection from the evil queen and those who were trying to find her.
the dwarves are happy because they are treated well with great houses
The dwarves are Bilbo's friends for most of the Hobbit.
The elven king thought the dwarves were there to steal his treasures.
The movies do not tell why the Dwarves are hated in The Hobbit and The Hobbit DoS. However, it is believed that past wars and experiences are the reason the Dwarves are hated.
The dwarves are interested in (as dwarves are wont to be) tales of gold and treasure, and Beorn, having little use for these items - - he has everything he needs - - is not interested in material wealth.