Publishing new site

I am rebuilding site. New theme, new content. My Old site is up and running, before I hit the publish button for new site, is there anything I should know. New site right now is just a home page with info as to new site coming. I want to publish this because I want the old site gone. I have left every setting the same. Am I hood to go. I did search this because I seen good info on this before but couldn’t find it.

Depending on your hosting…think you need to delete all old files from the server.
I have updated a few websites…so needed an FTP to copy all the old stuff to my computer hard drive (just in case) - then deleted old files (but check!! you might need to keep a few things?)…then publish.
Sure you will have better advice…dont ‘just publish’!!