What I would suggest for you is to buy an eyepiece and filter kit. With one of those, you get a range of eyepieces that will be suited to all the types of viewing you want to do, plus you'll get a series of filters that will compliment the eyepieces. If I were you, I'd get the Celestron Eyepiece and Filter Kit from Andrews Communications...
http://www.andrewscom.com.au/site-section-10.htm
They're about $380 for the kit. If you want to see what the kit contains, just goto the Celestron site...
www.celestron.com
and have a look at their eyepieces and accessory kits.
I would also grab a UHCS filter from Bintel....
https://www.bintelshop.com.au/welcome.htm
This will help with the light pollution by filtering out the unwanted light from lights etc, and allow the good light through. Since your scope has a diagonal for 1.25" eyepieces, get eyepieces and filters of this size. You can get an adapter for 2" eyepieces, or even a diagonal for them, but they cost more and weigh heavier. After that, it's your choice as to what you want to get for your scope.
Most important thing is to have fun using what equipment you've got and what you can afford. You get more enjoyment that way
