Here is a thread that one of my friends started, it answers a lot of questions and shows what she would prefer for the next time:
https://www.backyardchickens.com/t/832053/100-broilers-and-fermented-feed-project
I will try to answer as best as I can. First I suggest that you throw out the tractor plan and opt for a hoop coop instead. They are just as cheap and easy to make but they make your caring for the broilers much easier. With the tractor you have to crawl in to get any injured, sick, to feed, and to water. With the hoop coop you can still drag it around (use 1/2" PVC plumbing pipe or feed lot panels for framing) but you get to walk in to care for your animals instead of having to crawl in their poop.
You do not have to use fermented feed but I suggest it based on my experience with broilers. It improves their health (they absorb more nutrients), keeps them hydrated (because there is water in the feed), reduces feed needed for the same growth, and reduces food waste. The only con is it freezes in winter. To make FF the easiest way: Get a 5 gallon bucket, fill with enough dry feed for a few days, mix in enough water to cover the feed about an inch above the feed levels, add unpasteurized apple cider vinegar (one glug, does not need to be exact, the more there is the faster it ferments). Go out in about an hour and mix in more water to get it to the consistency of oatmeal. Stir it at least once a day and when you take feed out replace with more feed and water. You will not need more acv unless to empty it out completely. There will come a time when you get a white/grey bubbly film on top, just mix it in that is the growth of the cultures in the acv.
The 12/12 schedule is started at 3 weeks of age to give their bodies time to catch up with the growth and reduce health issues from over eating.
They need heat just like regular chicks until they are fully feathered. If it is warm outside you can let them out for time in a run of some sort (tractor or hoop coop) during the day with no heat. If they huddle together make sure to give them heat as that means they are cold.
I suggest unmediated chick feed unless there is a problem in your soil. The more natural you can get them the better it is for your health. The feed required is up to you. I had one 50# bag of chick (57 broilers) then moved them to 20% protein (either grower or high protein layer) (* do not give layer to chicks that are expected to live longer then 6 months)
Now for more advice: I made a feeder out of a cheap gutter (got idea from here). It cost $3 and was 10 foot long. I cut it into sections and it worked great. They always seem to be hungry no matter what you do so wear good shoes because toes look like worms to them. If you allow free ranging they range well. Have several waterers because they drink a lot. Put feeders or waterers on bricks to keep the bedding out of it. I don't care what anyone says, mine liked to roost. They poop a lot more then normal and cleaning it constantly is a pain. If you have a coop for them that doesn't move (for ranging) I suggest employing the deep litter method. If you move their enclosure on a daily biases (pasteurizing), you will have to move it often as they quickly soil the area. FF reduces feed waste because they spread the crumbles all over the ground and if you move them often enough to keep them on fresh grass that is a lot left on the ground that they can't eat. It will also cut your feed bill by as much as half.