In the cPanel file manager, there is a button to show hidden files when you first open the file manager.
In FileZilla there is a option under Tools I believe.
We are using Linux correctly.
1) You can find your databases in cPanel by clicking MySQL databases. You currently have one.
2) We don't do custom packages for free users.
3) Read http://www.yourhtmlsource.com/sitemanagement/custom404error.html