I want to know how I can color manga pages.

I want to be able to do lots of details like shading, highlighting, colors, etc. I strive to become an expert at these things.

Anyone want to provide tips? Things such as tool usage, plugins, etc.?

I'd also like to know how to color over dark colors, such as the grays in this picture.

http://img402.imageshack.us/my.php?i...banner2yx4.jpg

Any and all help would be very appreciated.