Hello hunter c:
When I look at your lines, I'm sure you use some kind of line/curve or vector tool.
As I have drawn with curve tools before I had my tablet a lot, I think I can help you out with this! I have quite some experience drawing without tablet
If you don't mind, you could set up a stream and I'd help you while streaming? I think this will help more than just writing a blob of text here since I'll be able to observe you live and give tips instantly this way!
Coloring with curve tool or with mouse is possible as well.
Though I recommend cel shading with mouse, blending is possible too, but... the basics should be there first, right?
Let me know if you're interested, I am always there to help you with what I can
That being said, I think when you learned how to properly cel-shade and make lines, this would definitely look great!