So what will the government do for evacuation or notifications on an incoming missile?

So im just wondering here. I live in north fl right outside jax. Not really alot of options here as im close to a naval port. So my question here is if i had no solid plan or not one good enough to execute fast enough should i try to ask for help thu evact at the nearest naval port,jax naval port to be exact? Would they even help me and my family? Would that be a ok choice? I figure only will have the time to make 1 choice and fast. Whats more is will the goverment notify us if one is…