I just started drawing with intentions of becoming better 2 years ago, and I improved significantly (but still not enough). All thanks to the tutorial videos i watched back then and at the present:
At first I watched Sophie-chan's youtube video:
http://www.google.com.ph/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0CCwQtwIwBWoVChMI77KupeCvxwIV0giOCh1X2gNf&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D4NABndKnAzo&ei=bKLRVe_MPNKRuATXtI_4BQ&usg=AFQjCNE87WXSf0Q0LJ9HOr10bpJx98crgg&bvm=bv.99804247,d.c2E
this one was really helpful, but more on the inspirational side. I just followed the step to step instructions and I was able to create a pretty neat drawing that i never thought that i could ever make.
It just really made me want to draw more.
When you're still in the beginner phase, watching MarkCrilley's videos in youtube can help you a lot also. They teach a lot of fundamentals in drawing that will help later on.
You can skip the last step though because Sycra's youtube videos have both tutorials for beginners, intermediate, and pros alike. Although his videos can reach up to 40 or more minutes long, but if you're committed, he won't disappoint.
You can also "buy" wink wink the books "How to Draw Manga Sketching (Manga-Style) Vol 1-5". They're quite a lot though so be sure to have some fortitude for reading them.
I highly recommend watching the first video, for encouragement. But also I more-highly recommend that you don't just stick to manga/anime style. It's best to have a versatile set of styles and skills in drawing. Drawing realistically can also help you in drawing manga, cartoon, and any other styles as they are all related and the concept are just the same as long as you understand them. That's why Sycra's videos are basically the art-foundation kit as he teaches everything that's helpful to drawing anything... AS IN ANYTHING!!!
When you're just walking around, or not even walking just looking at things though, try to absorb the information (or the form of objects or people).
The most important skill in drawing is observation.