Hey, so I talked to my friend about Copic advice for you and she said this:
"Hm some tips on copic...ahaha I still struggle with them. I guess coloring fast is the key to avoid unwanted strokes, but sometimes you can use strokes to create textures (ex: wrinkles on face). Practicing brush stroke helps too."
So, I hope that helps. Also, she said to contact her if you have any questions. That said, her name on here is Monarchism, or you could just click here: :iconmonarchism
Anyway, good luck with your art, keep chugging at it, and I hope to see what you come up with soon!