First. Think long and hard about your decision. If you have a good life, maybe you shouldn't make a major move just yet.
I lived in South Florida for 16 years.. Did all my schooling there and graduated form Miami Dade College last year.. Yes, there are LOTS of Spanish people out there. I did notice however there's a HUGE Cuban population, in Miami..and most of them are legal. Finding a job could be easy if you apply to family owned places..
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your dreams.