So, this really depends on where in the US you are going to speak Spanish. It's going to vary based on the community's make up. A place with higher Porto Rican people is going to have a different Spanish than a Guatemalan community or a Peruvian one.
So try and do a Latin American Spanish focused class and be prepared to be wrong when you actually talk with folks.
Any time! I make typos constantly, so feel free to point mine out in turn.