Hi bro! At the beginning I got very dirty with the drawings, then I learned to work with charcoal pencils, I managed to find some that are pastel, the brand is "Pointer" they are much cleaner, although those that mess up I keep using them to make hair or draw more rustic things, you just have to familiarize yourself.

Also, I use gloves that protect the dirt from the drawing area and paper linings so that I can not stain the work, clean a lot with the moldable eraser and a small vacuum cleaner when there is a lot of dust.

with respect to the other question, yes, I use the Ntopaz platform, I edit my posts in Steemit and I copy everything to ntopaz, after the post is published I return to edit, since I put many characters and sometimes the post is cut.

I hope I've helped!