New Bermuda yard help

So I planted about 3 acres of common Bermuda around late June this year in south LA. My question is it to soon for weed control are a pre emergent? I didn’t know if I needed to wait a whole year to give the roots better establishment or if it was ok to put something down. The grass is still somewhat thin. My goal is to over seed in the spring and fertilize heavy with nitrogen next year to try and get it were I want it. TIA!