I'm new to chickens too and have 14 chicks about 6 weeks old, in that group we got 3 barred rocks and one was starting to look more like a rooster (like yours in the picture) than the others... I suspected he was a rooster but wasn't sure, but now I know! I think mine might be crosses of some sort too. Their coloring isn't even... although he's the prettiest of the three.
Thanks for your help!!
Charlene