Step1: Select pen tool and ret it on paths.
2: Make lines with your pen tool.
3: Right click the path and select stroke path, it will do so based on the tool you chose (brush/pencil) so configure its size and stuff to your liking.
4: Delete or deselect the path.
5: Erase parts of your line to your liking.
6: Add effects as you wish...

There you go...