Aeldari Emerald 1) Start with a Zenithal highlight prime, then paint all of the armour plates ( except pauldrons) with Aeldari Emerald. You can paint the cloth with this as well, if you want, but I prefer to do that at a later step.
Black Templar 2) Paint over the top of the armour again, this time with Black Templar. You want nice, even coverage while still being able to see a hint of the green underneath. 
Aeldari Emerald 3) If you haven't painted the cloth yet, do so now with Aeldari Emerald. Include banners, tassels etc. - Eldritch If you have any tidemarks left from the contrast paints, now would be a good time to clean those up, using Formula P3 Eldritch as a midtone color for the cloth and...
- Lupercal Green for the armour.
- Garaghak's Sewer 4) Paint the leather (excluding pouches) with Garaghak's Sewer
Retributor Armour 5) Paint all of the armour and weapon trim with Retributor Armour. If you are painting the Champion, paint the pauldrons in their entirety. Otherwise, just paint the trim and the details (lightning bolt, face of Sigmar). Don't forget details like belt buckles, and the 'attachment bits' (sorry...don't know what they're actually called) that connect belt accessories (such as the short swords on their back hips)
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