Hi Bruce,
Thanks for your very quick reply. I am sorry but I am not really good with ArcMap, so not sure I understand the steps to do. My main issue now is that when opening ArcMap > Toolbox > Data Management Tools > and Feature Class, I don't see something called "Create Fishnet" . How can I get this tool, so that I can click on it and start creating my fishnet following the tutorials I found? Thanks