I agree with ThebBlackBullet tutorials are the best for now, try looking on youtube I'm sure you'll find some. I know on Sai they have a linework layer with different options for your linework, obvious, lol. I know they have a curve and a line tool as well as a pen, and it has a stabilizer for unsteady hands, you can adjust to your liking. I would recommend Sai to do your linework. Also play around with the program to get familiar with it.