1. Go to File > Manage > Database and add a text field called email.
2. You don't say what version you are using do I will assume the latest - version 11. Recent files are recent files so you can't change history and therefore their names. You can however clear the recent files list - go to File > Open Recent > Clear Recent Files. You can also manage your favourites which may be more useful to you. And then if you don't want to see recent files at all, turn it off in the Preferences.
Welcome to FileMaker. Enjoy the ride!