I have never needed to worm my flock, but would advise a fecal float at a reputable lab who will report species and numbers so you know if you really need to worm or not, and with what.
Other southerners may have different regimes due to it never freezing down there.
Ditto Dat!
Have some permethrin dust and/or spray on hand.
Check them over regularly and real well for mites and/or lice.
Google images of lice/mites and their eggs before the inspection so you'll know what you're looking for.
Part the feathers right down to the skin around vent, head/neck...