Hello Nick, and welcome to Eight Forums.
By default, Windows 8 will automatically sign in to the last user account that signed out at startup if that user account doesn't have a password. If that user account does have a password, you will see the sign in screen instead. To stop an account without a password from being auto signed in like this, you could use either option below.
You can enable or disable any startup programs you like.
If you only want a Start button, then you could "Pin to taskbar" the Start screen shortcut in the tutorial below and drag it to the left for that.
If you are wanting the old Start Menu and button back, then you could use an option in the tutorial below for this.
Hope this helps,