Large Build wire and electrical questions

Hello everyone. I am planning a large build. Starting with 1500mm x 1500mm and it will grow as I am able to make it happen. Rick 2.0 made a comment on one of my threads about don't skimp on the electrical since the wire lengths will be long. I have been poking around the forums and have not found anything to guide me. Could anyone help with with Wire Selection and any of the electronics that I would need due to the wire length.

Thanks
Shannon