My very first tutorial...! I hope I explained everything right, and that I didn't forget anything.
I don't know if "Vector" was the right category, but "Drawing/Painting/Airbrushing" didn't fit, either.
This is Part 1, which shows how to just make a line with the Pen Tool. And it doesn't require a tablet, yay!
This is done with Photoshop 6, by the way.
Please proceed to Part 2 if you'd like (or need) a little more understanding of using the Pen Tool~.
I hope this helps! Please feel free to ask any questions, in case there's something I didn't make very clear. x____x
Please keep in mind that this is just how I like to work. If this doesn't quite suit you, there are other variations to using the Pen Tool.