When did you start drawing with your kid?

FTM and have a 12.5 month old. When did you start giving your kid stuff to draw with and do you have any recommendations?

My son has been tracing his slobbery teething sticks over flat surfaces (slobber art, if you will), and it made me wonder if he was ready. My only hang up is that the poor kid has been teething since he was 3-4 months old and is working on his top molars currently. Everything goes in his mouth. Everything.