I found three old Disney stock certificates. What do I do next?

I was gifted these stock certificates when I was younger. (1999-2002) I have a total of 5 shares. I would like to transform it into electronic shares. I would also like to sell the certificate itself, I’ve been told they can be valuable. The only brokerage I have is through robin-hood. I would love some advice on how to get the most value. Thank you!