Well they might be just settling the pecking order and then they'll stop. If not,roos normally fight with each other but i've had a couple hens who put the roos in there place.
Im not sure if you can tell at ten weeks of age...but as they get older roosters have pointier feathers for hackles and there tail feathers are drooped more. Can you post pics?
Congrats! Getting a new animal is awesome!
For some really unique names type out unique baby names and there should be lots. Thats what i do whenever i want some cool ones:)