Welcome to Gaia! ::

Observation. Real life observation. Start by drawing real people, animals and environments. Study colour theory, inking, shadow and light, fabric, textures, different media (traditional AND computer), art history to better understand how to build pages once you start comics as well as symbolism.

Once you have a basic grasp of it all, then draw it more and slowly begin to stylize the stuff.

When you then starts comics, I suggest reading books like "Making Comics" and "Understanding Comics" by Scott McCloud.

After that you start with the script. Write it all down, the beginning, middle and ending... then rewrite it again, then have someone read it and see what they think and if they understand the script and then modify it again.

Then you begin to build your characters around the script, already having a background story for them help you implement elements that makes the characters believable. Once that is done then starts the same procedure with environments and such.

Then you do the thumbnails... which is a chart that show you the basic layout of the pages as well as where to put speech-bubbles and soundFXs. It also gives you a basic idea of how the finished product will look like.

After all that is done you check it over again, be sure to have the panels in a way that let the eye flow so the reader isn't taken out of the story by strange layout (always assume the reader is an idiot). After all that is done you start sketching the pages, then once that is done, you ink them... (and colour or screen-tone them if you feel the need for that)... Add text, SFXs, and all the other little things and you're done.

If you can't draw already, this should take you about 5-10 years.