The manga/anime that I draw in real life with pencils etc... ,not with Adobe photoshop cs2 or something, turn out great.
Just use this easy site to get yourself started.
By the way, I'm not going to say that I am a professional but I have to say I am a UBER newbie but the art work still turns out GREAT. It's so simple just go to this website and it teachs you the tutorials.
You also have a choice like cartoon, manga, people, animals, fantasy, nature, and 3D. Those are actually the catagories.
Here is the website :
http://www.drawingnow.com/how-to-draw-manga.html