Jim, to use such a sales page you will need to know how to use FTP or something like cPanel. Also, in conjunction with those, you will also need a server/host so you can upload those files. I recommend searching on YouTube the following:
How to FTP
How to upload HTML files in Cpanel
And I know there is more to it than just that, but once you have learned those, I’m sure you will have a better understanding of the whole process. All the best!