Measure the middle of the board. Glue the peg to the wood in the middle, and then use the peg to hold your papers.
Another way to do this I have used is to drill a small hole in the peg and bolt the peg to the board at the top.
Another way and much simpler is to just “peg” the paper to the top of the boar.

All the best from
James M Sandbrook.
20th of April, 2021.