How To Do Lineart In Krita

the stabilizer? I assume you mean brush smoothing. Set it to weighted smoothing and then adjust the strength until you find what feels right to you. Also if you want to have some fun sketching, download my brush pack and steal that sketching brush I made. (I really love sketching with that thing so many chances for happy accidents, and it forces you to limit your detail so you don't get too bogged in details, it's perfect for making a quick sketch before you do the actual lineart) rest of my brushes are for painting so I don't know how much use they'd be to you
Cool Krita Brushes by Cestarian

As for the line-art part itself, I mean there are some inking brushes in Krita that you can use (I hear the Ink_Ballpen brush recommended from time to time so you may wanna start there).

I don't personally like to use brush smoothing/stabilizer, I would probably use it if I did do lineart, but I'm more about just sketching and then painting (then again I'm not very good at any of it yet) I imagine if your lines are sloppy though the biggest culprit is your drawing technique, you may want to try to improve the way you wield that stylus before you start playing with smoothing too much, you don't want it to be a crutch, you want it to be a tool.

If you're gonna be doing a lot of lineart you may want to consider using something else than Krita though, as much as I love the program it is best suited for painting in painterly styles, you can't get a clean rendering of objects as easily as you can in photoshop (note the texture on Krita that photoshop and Paintstorm do not have, if you see banding on Photoshops and paintstorm's spheres it's simply due to a low grade monitor, but even then, it beats that mess you get on krita imo) because if you use a soft brush/airbrush there will be severe artifacting and banding in your gradients. I believe for lineart some program centered around manga drawing (like paint tool sai or clip studio) would be better, my personal choice is Paintstorm (but paintstorm has no text tool so no comic creation in there, yet). It looks like you're just starting in digital painting, Krita can be comparatively hard.

As a traditional painter you will probably have the best experiences with Paintstorm, Corel Painter or Artrage as these 3 seem to be the best for emulating traditional painting mediums.

(Example: A brush I made today in paintstorm, by accident that looks very much like a traditional paintbrush, this brush is impossible to create in Krita but you can probably make it in corel painter. The reason it's impossible to make in Krita is because what Krita has in segregated brush engines, Paintstorm has in one super versatile brush engine (it combines many options that krita has across several brush engines, but can't combine into one brush). Corel painter has many brush engines (more than Krita even) but they are also highly versatile.)
2 by Cestarian
If you want a clean digital look (like matt kohr's stuff) photoshop, paintstorm or paint tool sai are probably your best options, Krita 'can' do it but it's just not properly suited to it as things stand sadly, it's one of the reasons why I switched to paintstorm just the other day (I've used krita for years, it's been my program of choice since I started drawing).

Whether you stick with krita or switch to something else, just remember that it's important to pick one and stick with it, learn all the things in it before you try your next program because if you don't fully understand one program you have no knowledge to judge the other software by.

Sorry for drifting off topic like this but felt that it was important to mention, krita is as good as it gets in free painting software, and for painting in painterly styles it's superior to photoshop in my opinion, it's brush engines are also more versatile than photoshop's, but there are other things out there worth considering. But if you could afford a new laptop and an intuos, I'm sure you can afford Paintstorm or Sai (you should at least probably check the free trial for paintstorm to compare it to Krita, it's only $20 so if you decide you prefer it it's not gonna punch a hole in your wallet or anything if you want that hole in your wallet though, Corel Painter is second to none for digital painting if results are the only thing you care about)