Well like you said your a newbie. Graphical User interface allows newbies to advanced user have a more visual understanding and navigation. So if you are new and want to learn Linux, then install with graphical mode. The only time when you may be forced to use text mode is when you have unsupported hardware and you have to configure things manually and get drivers etc. Once your install go to a terminal window and you can play with some of your basic commands like ls, mv, mkdir, rmdir, rm, etc. But to learn commands best to use google. It has lots and lots of stuff for you.
Good luck to u