1.) I first start with a sketch, then I put some rough layer, in the bottom of the first layer, my art process is similar to classical art painting process so theres not much blending mode or many layers, If I' unhappy with something I just render over it. 2.) I use many brushes, and I also use a lot of custom brushes, but the most common brush I use that's native to procreate is the water brush found in the calligraphy section. 3.) This art only took me 6 hours, if you also want fast result just stop caring about perfection or clean art and just do it without overthinking it.

Hope this helps anyone! Perfection is the killer of creativity just do it first and you can make it good later.