Try this site, it has various tutorial,pretty detailed(although I don't use tutorials, I prefer to draw on my own, anda might find them useful =/) link
Well, anda really should try and find your own style of Manga art, but YouTube has a ton of great references. anda can also try and study the art of mangas and animes while anda read/watch them. And the Manga Fall in Cinta Like a Comic has a How to Draw Manga Mini Guide in the back of volume 2, I think.
Well, like other people say, anda should try making your own style of drawing. However, there is a person (my idol) who teaches how to draw Manga via the interenet and in his book called "Mastering manga". Here's a link (i think): www.markcrilley.com