Okay grasshopper. Your car is silver, right? Silvah doooyotaaaahhh?
You get a Claymagic blue bar. This is the clay you want and need. Meguiars is crap and Mothers is overpriced. One clay bar is more than enough for one car. Cut the bar in half. If you drop the one you’re using you will thank me later. If you don’t use the second one spray one spray of clay lube into the bag and seal it up tightly. It will keep for months. You may need extra clay lube (either cheap quick detailer or a drop of soap and water in a bottle).
Clay barring is super easy. It’s relatively safe. Use linear motions back and forth. It’s common to go with the flow of the wind across the car (because this is the direction, typically, that contaminates get lodged in the paint). You can cross thatch going perpendicular and then parallel (I usually do this but end with a parallel pass).
Do the cleanest parts of the car first. Typically these are the same panels you should start washing a car with (the hood, the roof, the trunk, then the fenders/upper doors, then the lower body below the bump strips and the bumpers). You can also clay bar your windows. It will make them easier to clean, they will stay cleaner longer, and your windshield wipers have longer life.
Just keep the surface wet working a small section at a time. If you don’t, well, I can guarantee you will do this. You won’t damage the paint, but you will get a smeary little mess. Spray more lube onto the paint and reclay that section. The lube will dissolve the clay and you can just wipe up the excess.
Very difficult to mess up anything while claying that can’t be easily fixed. (I do not recommend buffing as a means of contamination removal, btw 
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Where in Florida do you live? There’s a detailing retailer down there that may be near. http://www.detailcity.com/