Hi, welcome to BYC
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Most breeds get along fine together, but you are likely to have troubles if you want to keep 7 roosters all together. If you are seriously going to have 7 roos then you will need to keep most or all of them separated. Either you can keep the roos (some or all) in solitary confinement except for putting them in a breeding pen with the appropriate hens for a while each year; or you can have 7 different pens, each with its own breed of hens and roo.
Hens can remain fertile for up to a month after being mated by a particular rooster so if you are going to put hens of breed A in with a rooster of breed B, you would want to wait at least a month AFTER SEPARATING THEM before hatching any eggs if you want purebreds (I mean, obviously you will also need to put a breed A rooster in with those hens during that month, but my point is you cannot be hatching eggs right away after switching roosters, if you care about parentage.
Have you considered just KEEPING 7 breeds, i.e. just hens of most of them, rather than trying to actively BREED all 7 breeds? As long as you have some means of identifying which eggs come from which hens - and there are a variety of ways of doing it - you can certainly have 7 breeds of hen in with 1 rooster and only hatch the eggs from the same-breed hens.
That would seem to me a much more sensible way to get into it than jumping right in with a lot of different breeding pens or having to lock roosters up all the time.
What do you use on the floor for odor control?
You will need some sort of bedding -- most people use softwood shavings, the kind sold for bedding horse stalls and suchlike, but you can also use straw (chopped is better) or a variety of other materials, although they have more drawbacks.
Odor control is a matter of a) having excellent ventilation; b) having not too many chickens for the space (and ventilation) available; c) keeping everything dry; and d) cleaning as necessary. One thing that helps a whole big lot, odor control wise, is to have a droppings board under the roost that you clean EVERY MORNING (you just snowplow the poo off into a bucket you're carrying, takes mere seconds, literally, honestly) because then you're removing almost 50% of the daily poo output from the coop right then and there.
Good luck, have fun,
Pat