Sure no problem

basically the brush creation for these brushes was pretty easy because i already knew what i wanted because i had previously used these brushes in Photoshop so all i did was grab a pic of the dab and bring it into artrage and tweak a couple of settings.

If you don't know what you want the brush to turn out like its just lots of experimentation and tweaking of minute things (especially the grains i still don't get these!)
if you're looking for some lessons just search up "Artrage 5 brush creation" and watch a couple of videos (theres some by the digital painter where he explains what each and everything does) there's also one on the Artrage website in their tutorials category

hopefully this answers your questions
would love to see some that you make!