paint scheme

ey guys i am new to w40k and i was looking up the color schemes i saw alot o diffrent ones and i was like wow how do i choose if i make my own one would i need to make a codex or something like that and also i was thinking about black and white but people tell me its harder then other paint...

Hi. I've just recently decided to get back into 40k and i going for a chaos army but i would like some help with painting. I was going to go for a 'purge' army scheme but i can figure out what paints to buy. currently I've only got a squad of cultists, which is where I'm having the problems...

Title says it all I guess. Could anyone please list how they go about painting their scythes of the emperor army, I'm wanting to start an army of theirs and I'm wondering if I already have the colors and washes best suited for their color heraldry. And does anybody know where I can get some...