my suggestion would be to log in

you can find the username/password information for your distro on the
download page. Once you log in, if you want to see a traditional graphic environment you can enter "startx" but it doesn't make use of GPU processor on the PI yet so it will be a little slugish depending on what you're trying to do there. If you're comfortable with the bash prompt (the not graphical environment) I would stay out of startx. It's a lot more difficult, but it really helps you learn linux quickly!