Hey, Ben. Most brands' promo literature will identify the model or models that are good for beginner-intermediate riders. Generally, when the kite is laid out flat on the ground, you'll want a "bowed" shape on the leading edge as opposed to a more rectangular kite shape (sometimes called a "C" kite shape because of the way it looks in the sky). A kite that's described as a low aspect, easy relaunch, bow kite tends to be good for learning and early progression. If you find a kite that looks good, ask on this forum and someone will usually respond.
You may find that you'll be content with a 12-14 meter kite for a year or so. I'd be cautious about immediately buying a 17 meter when summer hits in Florida. A 17 meter kite is useful if you have really good kite skills and can relaunch in very light wind. But if you're still learning, it can be frustrating to try to relaunch and ride a 17 meter kite in really light wind. You may find that it's better to surf or go to the cable park on light wind days, and hold off on kiting until the wind is adequate for your 12-14 meter. But you'll know what you need/want as you gain more experience.
Have fun with it!