Hi there
For inking I primarily use the g-pen and then the mapping pen for fine lines, of course you need o experiment and see what's best for you and how you can spice up a page by using a particular style. As for getting it relatively smooth, having a graphic tablet really helps and working with vector layers when you're inking is a huge advantage in the long run
Of course nothing beats a lot of practice, it takes some getting used to but eventually you find a style that works for you whether it's long bold strokes or shorter fine strokes, you'll eventually figure out what gets in your zone. Good luck 