You should hire an attorney asap if you are within the 10 days of the ticket. Obviously the cop did not feel that he had probable cause or at least not enough to make an arrest. Schedule a hearing or comply with the 10 day waiver provision so that you don't lose your license but you have a good shot at getting the refusal tossed. Hire a lawyer to evaluate if you are within the 10 days.
You need to hire a local attorney to do a turn in or otherwise resolve the warrant and finish the vop. You can resolve a misdemeanor without returning to Florida, it will just depend on what the judge wants in your case for absconding.
dui manslaughter requires that there was a death, there was causation and the driver was under the influence of alcohol or controlled substances to the extent that the normal faculties were impaired. Vehicular homicide requires culpable negligence and the death. Both charges can be filed together. With a prior dui, there are heavy prison penalties under the guidelines and the judge can exceed the guidelines. Alos, with a leaving the scene the guidelines will go even higher. You should...
TPD has set up a panel which includes some very prominent people including Nick Cox, the statewide prosecutor. They will review every case as well as Mark Ober's office. I imagine a lot of cases will not survive the scrutiny.
You can seek and are entitled to 50/50 custody. Alimony will probably not be permanent but for a duration, if you can afford to pay it. Child support is statutory and a mathematical formula. She is entitled to 1/2 of the pension earned during the duration of the marriage, up until filing.