As the title says its for the new canoness but can also be applied to seraphim as they are basically the same thing.

1. Staring off with a undercoat of Chaos Black or Abaddon Black

Base

1. Mephiston Red This will be added to the under gown, this will be things like the sleaves the trail at the front and back, and if you choose a head with a hood, this will also be painted with this colour.
2. Celestra Grey This is going on the on any insignia around the model, you can find these on both shoulders at her sides and one hanging from her front, there's one on the energy pack and can also be found on some heads, this colour it also used for the hair if seen, the skull at her sternum and the beads around her waist.
3. Leadbelcher This will go onto those wing looking parts of the energy packs, any thigh bands and any pipes around the modal, the casing and blades of weapons and the head of a mace, and lastly, the trim on the shoulder pads
4. Balthasar Gold : This is only for the barrel and fuel container of the flamer, and the skulls on a mace.
5. Retributor Armour This will be on any trinkets there's one Insignia at the front colour that's gold if you refer to the picture and skull knees, this will also be on the rose on the sword, any finger guards and the orb things on the jump pack.
6. Rakarth Flesh any skin that shows.
7. Khorne Red this is for any handles for weapons and the underside of the gowns.
8. if you need to clean up any black areas you can always go back to Abaddon Black to cover it up.

Shade

1. Drakenhof Nightshade This will go on any Celestra Grey areas
2. Agrax Earthshade Will go on Balthasar Gold : and Retributor Armour
3. Nuln Oil Will go on Leadbelcher and the Khorne Red
4. Lastly Carroburg Crimson over all Mephiston Red

So now you would normally go back to the base colours and leave the shade in all the creases and pint the raised sections but this is your choice.

Layer

So in this section idk how I'm meant to explain layering so ill give you a list going Base -> 1st layer -> 2nd layer and so on and .. yeah apply it as you like.

1. Mephiston Red -> Evil Sunz Scarlet -> Wild Rider Red
2. Abaddon Black -> Dark Reaper -> Fenrisian Grey
3. Khorne Red -> Wazdakka Red -> Cadian Fleshtone
4. Celestra Grey -> Ulthuan Grey -> White Scar
5. Balthasar Gold -> Gehenna's Gold -> Auric Armour Gold
6. Rakarth Flesh -> Flayed One Flesh -> Pallid Wych Flesh
7. Retributor Armour -> Skullcrusher Brass -> Stormhost Silver
8. Leadbelcher -> Ironbreaker -> Stormhost Silver