If they have parental consent, they can get married.
Yes
In the USA an 18-year-old is a legal adult.... so yes, a 19 year old can marry whoever they want.
Speak to a lawyer.
Yes.
Certainly, if they have the parent's permission.
No
Florida don't allow minors to decide which parent to live with.
No
No, I've tried... hopeless. Why not just wait one more year? If a person loves you, they will wait until you are 18.
need court approval.
In most places Yes
If you live in the US it is.