Almost every Florida canal, pond and lake have shiners. I use my cast net most of the time but hook and line are easy. Rolo explained a good way but all I do is
1. Take a loaf of regular white bread.
2. Pull a slice or two out and submerge them in a bucket of water.
3. Bread is now nice and soggy, smack the slices against the water near grass or canal edges. I usually focus on 1-5 ft of water.
4. This will attract many blue gill, bream, talapia and shiners. The shiners will usually be underneath the bream, bluegill and if you have on good quality sunglasses you will be able to see them flash.
5. use #4-6 mono and a hair hook. You can use a SMALL float if you want too and even a small splitshot to help get the bait below the bream.
6. use a small piece of bread ball and fish where you chummed.
I will often chum 50 -100 feet of shoreline until I locate the bait. If you find a nice pond or canal, chum on a regular basis and the shiners will begin to hang out in that area on a regular basis and you won't have to hunt them.
You can also mix a little bit of flour and water to a paste. This makes good bait balls and stays on the hook pretty good too.
I've caught many shiners doing this. Don't forget that bream make an awesome bass bait as well as shiners.