Here is a list of art materials and tools that I use often:
Staedtler Mars Lumograph Art Drawing Pencils for base layer sketching
Strathmore 300 Series Bristol Smooth Pad for bleed-proof paper
Copic Sketch Markers (they're my favorite for illustrations)
Check out the Procreate Resources page for free brushes
Disclaimer: I only recommend products that I actively use. None of the links in this post are affiliated. They're meant to be a resource for you!