Some folks see the word "hybrid" with the sex link birds and think they're a species hybrid that is sterile, like a mule. Sex link chickens are NOT sterile, but that seems to be a persistent rumor. Course, then folks hear sex links don't breed true, and somehow in their brains that translates to they can't breed. Sex links, male or female, reproduce just like any other chicken. Your hens will breed just fine with your rooster. They're not so likely to go broody, so you'll probably have to incubate eggs and brood chicks. You'll have classic Barnyard Mix chicks, depending on your rooster you'll have a variety of colors and egg laying abilities.
If sex links couldn't reproduce, I wouldn't have half my flock lol. My head rooster for 4 years was a black sex link rooster, gave me the prettiest babies!