@ChickenyChickeny There's several posts on FF in here (must read), that's how I learned about it. Long story short - Nutrition from feed absorbed easily, no feed waste (fines & scattering), less poop, it's firmer (except the cecal) and no stink, also you will find they drink less water as they're getting it from the FF.
I also have a poop board (another must read) below the roost with PDZ (keeps the ammonia smell in check) & scoop poop as needed. Also doing DLM (another must read) in the Chicken House, shavings sprinkled with PDZ & DE. I keep adding shavings (no lumber mills here & no access to leaves, just grass clippings) as needed.
Depending how many birds you have, I only have 4 - 6 (residential limits) and start off with the smallest bag of Chick Starter. Once that is done I switch to Flock Raiser adding an extra dish of Oyster Shells when they start laying. When you start off remember dry feed EXPANDS when you add water, so make sure the container is large enough. Must not use any metal when fermenting the chemical reaction is "toxic", you may want to start the initial FF in a gallon plastic container to get a feel, it takes a few days to "ferment" but some just feed and keep adding to the mix, in time it will ferment. Some use a plastic gutter/trough style feeder, I use just a plastic dog dish, works fine.
The initial start up you may need to add a bit more but once that's started, to replenish I find 1:1 ratio works for the consistency I prefer to work with. Some posts say water should be 1" above the mix but majority find an "oatmeal" consistency works best. As for feeding, I use a soup ladle, start off with a scoop or two in the morning, refill around 3pm remove any left over for the next day when I close them up. I do not leave feed out at night. Feeding amounts/intervals differ to age stages, you need to figure out your birds.
Sorry turned out so long but hope I shed some light and hope you take the time to read up on Fermented Feeding, Poop Boards and DLM ...