You need to be looking now mate - they'll be starting to visit the winter areas already and those early signs can make or break a winter campaign. If you can, I'd be baiting those areas too (and keep that going all through winter). There is no point starting baiting in winter as you've already missed the boat and their metabolism will have slowed. If you keep it going in from autumn, they'll keep feeding.
Regards fishing in winter itself, be ready for long periods of inactivity. They will show you where you need to be, but the levels of activity are very low, and it often comes in the dead of night (1 - 3 AM). When it gets dark at 4 or 5 PM that can seem like a very, very long wait (by 8 PM it feels like midnight!).
Every pit is different but I've found areas of consistent depth near (not in) the deepest water can often serve as winter holding areas. Keep your eyes on shallower water when the sun comes out, especially if there are reed beds about.
It's worth trying to find out about past winter captures as the holding areas usually stay the same year-on-year in my experience.
Don't expect too much. Sometimes you can be bang on them but at the end of the day their metabolism slows so they simply don't need to eat much. That said, imo they will feed for a short period every day so if you can find where that is, you can sometimes set you watch by the takes.
The hardest thing about winter is staying focused as the hours pass by with no signs whatsoever. Just one single sighting can make the difference between a great campaign and a whole winters blanking, so you absolutely need to keep those eyes open and just keep going.
Good luck.