Fins????

Hi everybody! I am new to posting on this forum and have used it mostly for researching, all the advice is awesome. I have a 9' Bing Pintail Lightweight which I love. I have currently been trying to find a new fin for the board but I have no clue what the difference is between the styles, and sizes. I live in New Smyrna Beach, FL and surf the beach break/inlet the majority of the year. Any advice on the different styles and sizes and how they effect the ride of the board would be great! Thank you very much for any input, and thank you all for the rest of everything I have researched on this site!
Thanks again,
Justin
Thanks again,
Justin