Enjoy your new scope and enjoy your first views. As has already been said, go easy on the magnification, you don't need it yet. Remember the higher the magnification, the narrower the field of view, the quicker an object dissappears from the eyepiece, the more prone it is to atmospheric disturbance. Instead of thinking about a higher powered eyepiece I would say consider a lower power, better views in general. Read the information that came with the scope, you will have to learn to collimate, ask questions. If you need a reasonably good software program to find your way around the night sky, try Cartes Du Ceil
http://www.stargazing.net/astropc/index.html it is free, just click on the English version.
Most of all, just enjoy and gain a little more experience.
Cheers
JohnG