No setup manual afaik.
There are full service manuals available for download from the sram site.
Had one on my Mega switched to Monarch Plus now.
Not a lot to do really – set your sag with the floodgate open with shock pump.
Rebound to your taste.
IFP pressure should be at 250psi – with the correct adapter you can Change this – although RS don’t suggest changing this (older RS air shocks this was one of the tuning options). Don’t go higher than 250psi or lower than 200psi. Changed mine to 230psi and made it a little plusher on really rough descents.
Also worth doing an aircan service – just the lube side of things. Just make sure everything is as it should be.