I really like a woman from ghana I have seen her on cam so I know she is real and I would like to know what are the requirements for bringing her here to the united states and what is the cost for all of this? And how can I tell what is fake and what is real as far as passports and visas?

When she starts asking for sums of cash via Western union, or similar, THEN you know it's a scam.
Until then enjoy the ride..