Yeah, it's top left to bottom right for right handers - makes sense when you think about it and Miguel's suggestion for using a piece of paper or card to rest your hand on is very good to prevent smudging - artists do a similar thing for charcoal and pastels etc, and as ink smudges its good to do the same!
101 Dalmations Member
Yes, I use ruler every time I draw straight lines. Their are tutorials on how to ink using pens (variety of ink pens ex. G Techs, Technical Pens, etc.) and ruler or straight edges.