Go the The phraseology project. Really talented people are making some very intricate hand lettering. They also sell their finished work on society6. Once I painted my wall chalkboard I had no idea how to start. I was excited and couldn't decide so I took the easy route. I just mentored (stole) from the artists I admired to break in the chalk. Actually, I took their stuff and then slightly altered them.
Next up, I'll post some new work of my own this time. It will be dedicated to one Frank Chimero whom writes a pretty mean book. Tell you all about it in a few days.