Last fall I killed the entire lawn with round up and re-seeded (slit seed).
There are weeds in the new lawn that seem to be spreading (even though it is
winter).

Anything I should do about it now?

I've been looking for a maintenance schedule for fescue that is applicable
to the Carolina Piedmont (when to apply fertilizer, pre-emergent weed
killer, etc) but haven't found one online.

I'd appreciate any suggestions.

Thanks