You said that these zombies will 'ignore any wounds that are not immediately fatal such as decapitation or destruction of the brain.' Is this a typo or is this actually an element of the RP?
This is an element of the roleplay -- our zombies do not feel pain or fear. Ripping off an arm or a leg would undoubtedly kill them due to the blood loss this presents, and a weapon's "stopping power" is only useful if it can momentarily knock a zombie off its feet.
Are these zombies able to disobey the laws of thermodynamics and continue to walk for weeks on end without a source of food or will they naturally perish after some time?
No. In descending rank of preference, zombies eat humans, animals, unspoiled food they come across, canned or jarred food they come across, spoiled food they come across, small or weak zombies, and dead humans/zombie bodies. Starving zombies do not feel the pain of starvation, but they are more lethargic and are prone to fainting. Zombies dying of starvation will keep walking and fainting until their body has eaten all available fat and their organs start to shut down.
I'm also assuming judging by the description of stags being affected by the virus, I'm assuming that there will be animal zombies in this RP as well?
Only if I can make it fun to read. The cast stumbling upon a herd of wild zombie horses standing silently in an open field? Zombified bears, bulls, and crocodiles being used in a slew of endless boss battles? Kinda trite.
Is this outbreak local in Florida only or across the entire USA? (This is probably a spoiler question but I'll just ask out of curiosity.)
Who knows? Not a bunch of farmers, that's for sure.
Are we facing opponents who are tool using, self actualised individuals capable of communication and transference of skills within large social groups, as well as working together to solve problems and devise rudimentary tactics, such as laying traps or setting up ambushes?
The answer will not change linearly as the story progresses, but fluctuate like the shape of an amoeba. If you see where I am going with this, which I don't think anybody does yet, you would understand what I mean. If you don't, count yourself lucky that the plot has not been spoiled for you!
If we're setting the roleplay on a small family farm, how badly did the agricultural depression of the 1920s affect the family? Have they recently benefitted from the Agricultural Adjustment Act enacted by Rossevelt, or has the production limits set on their corn and cotton crops been more of a burden to their business?
Farmer Tackett is just as good at business as he is farming, so the answer to your question is that it helped. They expanded their corn and cotton to meet the maximum limitations while doing even better business with their many other crops.
How has the repeal of prohibition affected the farm? Was Farmer Tackett's basement only recently converted to the storage of liquor, or was he a bootlegger up until a year ago? Does he have a State approved license for the liquor, or is he selling it under the table?
The Tackett basement has always stored dry goods and liquor, though Henry Tackett added a moonshine distillery during prohibition, which as you can guess, was good for business. Aside from foodstuffs, the basement stores liquor for Tackett consumption, liquor for legal sale, liquor for illegal sale, and the trusty moonshine distillery.