What do you have in mind? rebar? I do plan putting in the footer at the door but didn't plan on doing all in rebar. The concrete will not bear building load also frost heave isn't a concern in Florida. If I understand right the fiber helps to prevent cracking.
Properly placed rebar is the proper reinforcement that will provide it's intended function. Mesh is useless and fiber is for surface shrinkage cracking only. It provides no primary load reinforcement. None.
If you place any weight on your slab, you have a load, regardless. A 200 lb person may not be relevant but a light-duty vehicle such as a 2500 / 3500 series truck will put ~ 8000 lbs of load. Mesh will do nothing for you in any regard. Rebar in the footer is a must as far as I am concerned.
Rebar is your call, but to additionally control cracking, place joints in your slab (very liberally) to control where you want the cracks to be, otherwise cracking becomes random. I personally recommend placing control joints as the concrete is finished, in lieu of saw cutting later (the lazy man's way) as stress has already had an opportunity to build once curing begins.
Three-thousand lb mix will normally test out to about 8 - 9k psi after 30 days (if you were to keep a sample and test it in a lab, easy enough to do). If you want to see how your cure is going during the 30 days of hydration, keep out 4 seperate samples and test one at 7, 14, 21, 28 day intervals and watch the sample results when placed in compression. It's kind of neat to see just how 3000 lb will turn out.
Have an air-entrainment admixture added as well. Your location is not necessarily needy of air entrainment but add it anyway. The may do it at the batch plant, but mention it to make sure.
