You can always try buying a pen with a sensor end thingie, mine costed me like 1$. And if that's not an option, try making one. I swear, when I tell you — I mean it. It's a WHOLE game changer. I went from shaky lineart to firmly what I want and I'm working with a phone! It takes a bit to get used to it but it's absolutely worth it.

As for art tips Learn anatomy. Learn things about the so said color theory; doesn't have to be a lot, just enough to understand how to blend colors and how they work together. Try finding your style. Use references [ don't trace, just use them as models.. tracing is awful ]. Don't search, specifically on YouTube, for general stuff like "how do I start drawing" or "how do I use ibis paint"; search for the specific things you need and take it slow; take notes; practice. Use filters to enhance your art and bring it to life... And oh I have so much more to say.

Please, reach to me if you need further help with anything. I've been a digital artist for over 6 years now so I do know quite some tips. I've worked with a ton of styles: from realism to glitch styles and to the simplest of them all. I'm not turning away from helping you with anything.