Hi anon! Sorry it took so long to get back to you.
-It really depends on what you’re trying to do. I only really go to Illustrator for vector heavy things or anything that is graphic design based. Again it really depends on the person and what they are trying to accomplish.
-Yes, for any drawing or illustration that I state is digital its most likely done in photoshop. As for what brushes, I think you mean a chalky sort of texture? I use an assortment of brushes I’ve collected over a few years from some artists. I also highly recommend checking out Kyle T Webster’s Brushes. He really makes awesome brush sets for an affordable prices. He also has some free ones on there too! I also create my own brushes by messing with the settings with the default brushes until I get the look I’m going for. I would go to the Dry Media Brushes in photoshop and see what you like, it’s really fun to create your own my modifying the existing brushes in there!
-As for tutorials, I’m starting to post video’s on my youtube and vimeo channel, they are more of sped up footage of me doing an illustration. But if you’re looking for something more specific, like “how I do _____. ” Then I guess it would depend on what it would be you’re inquiring about and I could help you further on that question!
Keep practicing! You’ll get it! :)