One of my favourite cartoonists/artists is Kate Beaton. She recently had a Q & A session on her Tumblr, where people would ask her questions, and she would reply. Like a Q & A, you know. Someone asked "how do I learn to get better at drawing?" and this was her reply:
"You do this by drawing, drawing, drawing, drawing, drawing. You don’t need a special pen or paper, you don’t need a desk by a window overlooking a pastoral scene, you don’t even need to take classes, you just draw draw draw draw draw every day until you’re amazing at it."
Here's an embriodery of Kate Beaton's Fat Pony I did a couple of years ago, just 'cos he's cool.