Len cut a piece of wooden board for me that would fit perfectly in the frame. He also bought chalkboard paint. So I painted the board and let it dry overnight. I started off using a roller paintbrush but it didn't seem to be sticking well to the board so I switched to a paintbrush which worked better.
The next day I hung up our new chalkboard in the dining room. I've been using my Chalk Ink Marker on it but I think I may need to get a thinner tip marker. Either way I am happy with the result and I look forward to getting creative with what I'll write on the board.