[Helsinki Harlot]

I'm not sure about tutorials. You just kind have to get used to drawing. Are you going to be doing a lot of photoshopping or simple drawing? Because you just have to get used to holding the pen then.

I'd go on DA and there's a huge selection of free line art that you can download to practice pen handling with (just coloring in and stuff and playing with the settings.)

Other than that; drawing from models and pictures is a great tip. I usually use http://senshistock.deviantart.com/