http://www.creativebloq.com/digital-art/illustrator-tutorials-1232697 Creative bloq has tons of illustrator specific tutorials ranging from beginners lessons on how to setup a document, use the UI and tools, to specific effects and complex procedures within the program. I would highly recommend you taking a look at these - its how I started my adventure with illustrator as well
There's a lot of free stuff on YouTube. It's only a matter of incorporating all the lessons on there. You could also check https://www.creativelive.com/ to watch live workshops on how to use programs like Illustrator and others.