Check our FAQ. The tutorials will get you started, but just like any other skill you'll need to practice and study a lot of things on your own.

Also, remember that color theory, composition, anatomy, animation, and etc. are just as important, but these are not concepts specific to pixel art so you'll have to look into these broad art topics yourself, if you're not already familiar with them.

When you have started working on anything, come back to the forums and make a Work in Progress (WIP) thread. That way the community will be able to give you some feedback.

And most importantly, don't feel bad if your gallery submission gets rejected for some reason. Just come back here and we'll be more than glad to push you in the right direction.

Good luck, and good pixellin'!