Hi Adam and welcome to IIS!!
Congratulations on the scope. The 8" dob is in many opinions, including mine, the ideal beginners scope. the reasons for this opinion are several but the main ones are that they are easy to setup, easy to use, relatively inexpensive, easy to sell if you decide visual astronomy is not for you, transportable and have enough aperture to see a lot of "stuff".
As to what you are seeing, "full moon, middle of suburbia" is ticking the 2 main boxes of less than ideal observing conditions. the good news is that the first one will be improved in a few days and you will see a major difference in the views of deep space objects. If you manage to get out to a dark site (and being in Vic I cannot really advise about that in Qld!) you will see even more.
One thing to be aware of is that you will never see things like the wonderful images that you see on this site and others on the net, but tink about the fact that the light you can capture in that scope in amny cases has travelled for thousands or millions of year to reach it. And of all the billions of people in the world, there are only a very small number who have the chance to view these wonders of our universe - and you are now one of them!!
On a mor technical note, I am guessing the scope came with a 10mm and 25mm eyepiece? With your barlow, that gives you effective FLs in your eyepiece box 25, 12.5, 10 and 5, which should be more than enough to go with for a start. My usual advice, especially with viewing DSOs is "use the eyepieces you have for a while". you can spend (read "waste") a lot of money chasing improvements via eyepieces, but unless you have a clear idea what you need you can end up with just a full eyepiece box and an empty wallet. If you have a 25mm plossl or similar, that will handle most of your observing for a long time. I used almost nothing else for a bout a year in my 8" and 12" dobs that i started with.
Anyway, hope this all helps!!
Cheers
Malcolm