Ok, I reread your question again........ I know my "directions" were vague... but still I can't understand the first part. Be a bit more descriptive.
First Make sure tool is set to paths. (I'm too lazy to figure out the 'shape' preset - to draw unfilled areas, just lines)
Std. Pen: click to add an anchor - click again to add another point (straight lines), click and hold then drag (for curved lines)
Freeform Pen: Just draw over existing art (must have a steady hand)
Then Right click on a path, then select stroke. Choose paintbrush (make sure you set the settings on the brush first)
As for rasterizing - that changes any vector layer (ie text, shapes, and pen tool) into a normal layer (some what like flattening) | 
