For the placeholder page: Just a quick note saying its been set up. What we do is have our logo and a quick message saying the account has been set up but not yet been customised. It doesn't need to be complicated at all, you could even use the default ones.
For the email: Logon details for control panel, FTP, nameservers/domain settings and email details. If its your friends and family and not commercial then it doesn't need to be amazingly slick and professional, it just needs to tell them the things they need to know to use the webhosting.