Welcome! You've already done the first thing right...knowing to build the bits and then get the chickens.
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some things from our coop building experience...
the roost is more important that we gave it credit for. that is by far where they spend the majority of their time (in our case anyway). so, get the height right & give it space so your chickens have enough room in front of them and behind them that they're comfortable.
i've discovered chickens have their own "pecking order" (imagine that). so two roosts allow those who are on the low end of the totem pole to move out of the way when they find themselves up against their nemesis when it's time to bed down. my roosts are parallel and about 14" apart. they jump back and forth between the roosts until everyone is in the spot they want to be for the night. then peace decends.
i admire you for taking on the construction yourself. hope you really enjoy the whole chicken thing. i know i do.