So, you’ve just installed WordPress for the very first time, but you still see your hosting provider’s default “coming soon” page. Two things could be at play here, but they are fortunately very easy to resolve.
More than likely, there is an index.html or home.html file in the same directory as the WordPress index.php file. Remove the index.html or home.html file, either via FTP or your hosting provider’s file manager, and all should be fine.
If that didn’t help, your server isn’t configured to recognize index.php as a valid index file, which is thankfully very rare. Access your server via FTP and try adding this to the top of your .htaccess file with a plain text editor:
DirectoryIndex index.php index.html index.htm
Both of these should work to cure your generic home page woes, but if they do not, stop by the WordPress Support Forums for further assistance.