Guide
Moving a website sounds bigger than it is. You keep your , book new and copy the files across. Before you start, make a and keep it somewhere safe.
Then you change the entries of your domain so they point to the new server. For a few hours some visitors still land on the old one, which is why both should stay online for a day.
Check that the works on the new hosting, and set a for every page whose address changed. Your will thank you.