Ok I meant with bretonnia. The round table site used to have threads with tactics for facing each army, but with that forum closed I can't ask them. I just want to know what units should I lean towards, and what items.
Sadly, Bretonnia vs. anyone in 8E is going to be a struggle because you're two full editions behind.
You're definitely going to want the Virtue of Heroism, Other Trickster's Shard, and possibly an 'extra attacks' sword on a peggy combat character. His job is solely to go after the Demon Prince or whatever other big gribbly the Demon player brings. Rain a bunch of attacks in, hope for the killing blow to come up, and hope the OTS blocks that save. If it doesn't, he's toast.
Are you using End Times Lords/Heroes allowances? If not, then at 1,200 points you won't be facing any greater daemons, and are unlikely to have a Daemon Prince to face either so at the most it's a Hero level character you'll have to deal with. Any idea if your opponent has Epidemius, as that will make things very tricky?
He might, he's mostly nurgle and tazeech with a little khorne. As far as the lords allowance, I'm actually not sure if we are enforcing the faq. Since we are both new, is that a good idea or a bad one? I have only played one game this edition with a guy from here. He's never played since 7th. We used to go to the same shop, but we never played each other before.
Daemons and Brets are armies I have less experience with, but some general advice:
Most daemons have little to no armour, so don't worry about having to get through armour (though you'll still want good strength to wound Nurgle units which are generally fairly tough).
Anything that can negate/reduce ward saves is useful (e.g. the Other Trickster's Shard, as mentioned above) as virtually every daemon unit has a 5+ ward. Put this on your main combat character.
All daemon units cause at least Fear, so high Leadership / a BSB are crucial, or Immune to Psychology - handily your Knights Errant get that on the charge. Your peasants are likely to fail Fear tests if unsupported.
Nurgle are all -1 to hit in combat, so your low-WS peasants are going to struggle to hit - it'll be a 5+ if they pass their Fear test, or 6+ if they fail. Errants' low WS will hurt them here too, so maybe send them against the Tzeentch units.
You've got a range advantage over a Tzeentch/Nurgle daemon army, so use it. Bowmen don't have a -1 to hit when shooting Nurgle, and a Trebuchet is always useful. From recollection, you don't need to worry about Regeneration, so don't bother with Braziers on your bowmen.
You've got a speed advantage too - a mainly Core Nurgle/Tzeentch list is mostly Movement 4 infantry. If he's got no Screamers, Discs, Beasts of Nurgle or Plague Drones, you should be able to pick and choose your Knights' combats.