You can get 3 templates for Krita already set up with a good ‘paper’ or ‘canvas’ for oil, for watercolor and for pastel. Layers are already in place and adjusted for you! The download is https://files.kde.org/krita/extras/Smart%20Canvas%20Templates%20for%20Krita.zip and the explainer video is https://youtu.be/xpWmQ-OY36I. Just open those templates in Krita, go to menu File -> Create Template from Image. And while you’re in the ‘Extras’ folder at KDE.org, get the RGBA-wet bundle. That’s the wet oil brushes for Krita 5. The dry ones come with Krita. I don’t know why the oil brushes are named RGBA. (The explainer video: https://youtu.be/FxjCk-yTIzI )
I’m sketching with the oil and watercolor brushes:
Yummy paper and canvas look. Oh, and the watercolor brushes! The wash brushes get more watery as you apply pressure! I love those programmers.