Type startx
I'm assuming you mean how do you get to your gui environment. startx will start X for root, kdm or gdm will start your login manager. If you want to change this, open your /etc/inittab and run a search on this site for what to change, it's different for some distros.
You can read the email with mutt, or pine, or even just type 'mail' and you can read it if that's what you mean.
Cool
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