I don't think you'll want to tackle a full tear-down restoration do you? I'd suggest as a first step to give it as throrough cleaning, top to bottom, front to back, as possible. From such an intimate activity it will easier to proceed to step two, which will be to identify any mechanical issues or components that require attention or replacement.

Posting photos here might help with getting a rough idea as to its current condition (instructions for images in the FAQ section - you need to have created at least three posts too). 

I use Mothers California Gold Brazilian Carnauba Cleaner Wax for the case and have liked the results. I don't know if it's available in Australia or not, but it's meant for cars, so I'm sure there are plenty of comparable products available. For grease/oil/dirt on the metal parts I use Varsol, and hundred's of Q-Tip swabs.

 

Here is a picture I quickly took of it, I'll post some more photos of the insides of it when I get home from work tonight.

Beware of repairs that you cannot finish and have to go to professional,  their rates seem to being going up,  I mean like$125 an hour!  I needed a carriage put back on a Smith Corona Portable and it ran $225.  Granted, he said that me spring broke on the draw coard too, but it was working when I brought it to him.  On another machine, 1941 Underwood Standard, the caps were out of line with the lower case, and I took it to another repjairman: over $220 later he hadden't fixed it,but charge for examination!