What can a 12 year old do as work?

In some ways it depends on why you want a job. I'm guessing money?

Here are some.....

-: Walking & sitting dogs

-: walking & sitting younger children

-: washing cars

-: mowing lawns

-: paper route

selling old toys, books, clothing etc. on Ebay or craig's list (only if your under the circumstances of needing money)