Hi Luke. Congratulations on your purchase. It is a great scope and you will have lots of fun with it.
The first purchase I would make would be a moon filter. I think a neutral density filter is best as it doesn't give you the green tinge like the cheap moon filter do. As for eyepieces, I suggest a 10mm Plossl, which will give you 125X, as well as a 32mm Plossl, which will give brighter wider angle views.
You can purchase these at any good astronomy shop, there are a couple in Perth, or there are quite a few very good Australian online stores.
I have written a simple setup sheet for the Nexstar SE scopes. It is in pdf format and I could send it to you if you like.
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