Roosters

You don't need a rooster in order for the hens to lay eggs, but if you want chicks, that is another story... 

Most hatcheries guarantee 90-95% sexing accuracy, so if you order 25 pullets, that is 2-3 roosters.  If you order less pullets, they will fill up the 25 chick box with "roosters for warmth".

Some people like to have roosters around because of their beauty, some because they protect the flock by watching out for predators, keeping order among the hens, etc.  Some even like to hear their morning crow.

It is up to you (and any ordinances in your area) if you want a rooster.  However, if you have small children, a rooster may consider them a threat and go after, and possibily harm them.

I have eight mature roosters and their personalities are all different...

I have a speckled sussex Roo and he's is so good with the girls. I'd say he was gentle but he attacks everyone but me. He's my most gentlemanly Roo though and he even lets the girls eat first!

Some hatcheries guarantee a level of accuracy, like 90%, but even that allows for 2 to 3 in a batch of 25. I'd bet you could find a rescue rooster pretty easily if you end up with none, though.

I'm back! When I ordered from Mcmurray I ended up with seven Roos out of 26 chicks, much more then I was planning on. I still need to get rid of two!!!!

I wouldn't worry about crowing that young, but there are always exception. I'd worry about the massive chick dust and odor first if they are inside for that whole 8 weeks.