About getting a visa to visit relatives in the United States?

In this case, you can't apply for a visit visa, but you can ask your friend to find a company to get an invitation letter from the United States, so you can apply for a visa.

Theoretically, you can't work during this period, but you can go to some small restaurants, like some Chinese restaurants. They don't look at visas and pay cash without paying taxes. However, if it is discovered by the US Immigration Service, it will be sent back to China immediately, and there is no hope of going there again.

The cost is up to you. It will be much cheaper if you stay at a friend's house. If you stay in a hotel, you can get it for 20-30 dollars outside a big city. The cheapest one night in a big city like new york (under the condition of ensuring safety) is about 80- 120 dollars.

Traffic in big cities can be solved by subway. If not, try to get a car (rent or use your friend's). In the United States, having no car is just like having no legs, which is very inconvenient (except new york). Prices are still acceptable in the United States. Just buy food in the supermarket.