^^^What Jake said right there is the way to do it.^^^

I can't believe the prices that stores get for bagged-up floor sweepings with a "food plot mix" label stuck on it.

In August - disk up a patch of ground that's in a good spot, broadcast your seed, drag it in. Done.

If there's a stand of fescue on it I'd spray before I disk. If there's no fescue I probably wouldn't even bother to spray.
A few weeds aren't going to hurt anything. And don't forget that it's just a food plot - don't work the ground until it looks
like a lettuce bed - all you need to do is rough it so there's enough loose material to cover your seed when you drag it.