First of all, congratulations on the certification, and welcome to the Board. This exact same question gets asked like 3 times per week. You really need to just review the last couple of pages under the South Florida forum, and you will get lots of info. You then need to call the dive ops referred to, explain your situation, and decide who you feel most comfortable with. I have used Quiescence and Blue Water which are truly right in Key Largo, and Conch Republic, which is about 10-15 miles south, in Tavernier. All were great ops. BW and CR both are active participants on this Board, which I think earns them first look. Do your search, and then ask specific questions if needed.