While we are all willing to do what we can to help you with your keyboard, you might want to add
www.psrtutorial.com/ to your list of sites you visit regularly. There the members specialize in Yamaha arrangers, and can share a lot with you. There's even a forum dedicated to the E series arrangers -
http://www.psrtutorial.com/forum/index.php?board=64.0. There are also free styles on that site that you could load onto your keyboard in addition to the built in ones.
If you're married (or merely live with someone, or live in an apartment with thin walls), do them a favor and buy a good set of headphones. If the keyboard didn't come with a pedal, you probably will want one. Other than that, you're probably good to go until you're ready to play Carnegie Hall.