Here's a couple of brushes that I personally use that might be of use.
Here is a brush set that may be of use.
Here's an example of what they look like.
(here's their individual explanation)
Basic Pencil - This pencil can be used for lining, but I don't recommend using for anything else. (or atleast sketching.)
Sketching Pencil - This pencil can be used for sketching. (of course) But I don't recommend using it for anything else.
Smooth Marker - This marker can be used for coloring, or shading. You can also use it for lining.
Textured Blender (1) - This blender can be used for when you may want a canvas looking type of blender. (Great for baggy clothing)
Textured Blender (2) - This blender can be used for when you may want a cloudy looking blender. (Great for Wrinkles in clothes.)
Brushes