How does one go about creating textured brushes and fill textures such as charcoal or chalk texture?

Just checking do you have the pro version?

You basically just import textures you make in another program like photoshop. You need to make sure they are tileable.

Figured it out! Thank you!

textures : "you need to make sure they are tileable"
how to do it in Animate pro 2 ?

look for tutorials in photoshop or psp on how to make tileable textures, there are tons of them.