You probably won't find a complete guide to drawing so think of tutorials and other guides as advice. There's just too much to learn so don't get discouraged if you aren't seeing results immediately. You probably won't notice any improvements for weeks or months (Years even), so just accept that you're going to suck for a while, and think of it as a continuous learning experience. What discourages a lot of people from drawing is when they start comparing their art to another artist's, which is a bad idea because that other artist was probably working at it a lot longer.
Generally you want to know the basics before you start making cartoony/anime styles so it's imperative that you have something to work from. If you're into characters/people, then get at least one anatomy book (I have like 5 or 6 now lol but you don't need that many if you're just starting out) that you can quickly refer to when you have a question about proportions or placement of limbs, etc. The more you understand anatomy, the easier it will be for you to exaggerate different body parts and develop different styles yourself, rather than just limiting yourself to a style of something such as your favorite anime/manga.
Bring a sketchbook to a nearby park or coffee shop, or anywhere you can find people or other 3-dimensional objects, and just draw them. The more you know about what you're drawing, the better. If you're drawing something small like a rock or an action figure then hold it in your hand, observe it at different angles, and understand what it is you're trying to draw. It would be ideal if you could get a live model or have someone pose for you, just don't rely on copying photographs or other 2D images. They're okay if you think they'll help you learn something specific but you want to learn how things behave in 3D space.
Post your work somewhere and ask for critiques. Don't be afraid to receive criticism. If you get comments like 'Your drawing sucks,' ask them to explain why they think it sucks. If they don't give you any useful information, then ignore them and focus on the ones that provide constructive criticism. Sometimes you'll get both in the same comment but just focus on what you can learn from it. Ideally people should be pleasant, but this isn't always going to be the case so don't let negative comments hit you personally, just brush them off.
I'm nowhere near the level I'd like to be with my art but if you have other questions let me know. Just start somewhere and stick with it.
