Ok, since there's a bunch of d0uches here, Youth came because he's an artist.
There's a lot of different ways to color. I'm pretty sure the way you want to color is digitally.
1. Lineart.
This is where it all starts. The best way to transfer ya shit to digital coloring is with a lineart. Otherwise it'll be more sloppy. First thing you'll wanna do is find a linearting program or a digital art program. If you don't have a drawing tablet (actually, even if you do), I recommend Paint Tool Sai. If you need the pirated version I'll get it for you later. Otherwise you can just get the 30 day trial and pay for this stuff. Lol
Lineart's basically where you go over the drawing/scan using digital lines that'll make the overall drawing look legit. You're able to curve and form the lines however you want, meaning it's simple to make the figure you're trying to, despite what you're doing (your own art, manga scans, even logos).
If you need help with how to lineart I'll explain it to you later on, ya dig?
I'll teach you how to pressure and weigh the lines too if you want. Lol
2. Coloring
This is where shit gets even harder. First thing you gotta do is find the color you want to color with..
*Cough* Photoshop *Cough*
Photoshop is the best thing you can use for coloring shit. It's just plain amazin. U_U
I know where you can get a Photoshop pirate too, but if you want the legit version its like 20 dollars a month w/ a 1 month trial.
You open your lineart on there and the rest is stuff I'll explain later, dig? So go and get these programs. I mean, it's up to you what program you use but these are the ones I use, and the best ones imo.