>>13893609There is no best tool, so I'd try different ones. Remember you can also make new brushes, so make several and try them at different settings to see the difference between them.
Also, before sketching lines, think about shapes and perspective. Start with a focal point, say the head, use a shape like a circle to represent it, then start adding lines and shapes, starting with a focal line to shape the body around. This is just a suggestion mind you, and I'm awful at explaining, there's books out there that do it better.
