US Immigration from Jamaica

Can anyone tell me if you have paid all this money to file paperwork. They have your passport and waiting for DHL. But I was reading that once you enter the USA you have to pay another fee .please anyone is this true .and what's the price of it please and thank you.

I need help to help a friend who is a us citizen file for his spouse and 2 stepchildren who came and visitors visa and didn't go home. Do they file I 130 and i145 separately for each of them so 3 of each?. Also is medical done now to be sent in with I145 and I130 or later on when they request it?

From the caption above, is it possible to get a SSN not valid for work even with expired I-94 (B2 visa) was used for entry. Please feel free to provide any information about. Thank you.

To anyone if I'm flying from Jamaica to the STATES will I be required to show the airline a negative Covid-19 test or do I have to take it before I buy my plane ticket. Any advice on flying to the STATES

How long it takes to hear from the embassy office once they have your passport and police certificate. How long you have to travel before it expires.