One of the most popular posts on my blog is the one on online whiteboards - I use them a lot. There may be something here you can use.
Hello Colleen thank you so much for your response. I am looking at using either Twiddla or Cosketch moving forward. I really appreciate the information you provided me.
My pleasure. I hope it goes well.
I see that people still click on the link here - note that I completely updated this popular post on writing mathematics online.