You wrote you aren’t paid. Do you mean you WEREN’T paid?

No apostrophe.

I wouldn’t use « look out for your neighbors » for take care of them. I would say « Look after them. » If someone told me to look out for my neighbors, I’d be worried!

I don’t understand your question.

Concern isn’t used very often as a verb. It’s a little formal. When used as a verb it means “to be about” or “deal with.” For example, “This story concerns a friend of mine.” In other words, “This story is about a friend of mine.” Near and nearby: I would end a sentence with nearby, not near. “My friend lives nearby.” In contrast, I’d say, “My friend’s house is near mine.”

The second is much better, but both are grammatically correct.