This is how it works in NSW...
45k and over is a serious breach.. As for it being a criminal offence.. No.. But it does stay on your driving record. There is no court appearance needed, but remember this is considered as bad as drink driving.. If you do 3 offences you are considered a habitual offender and can look at jail time... But that is worse case..
You can appeal, but saying you need your licence for your job is not enough to overturn the decision. The judge will just say that you had your job before you were caught speeding, so your licence/job does not mean that much to you. And if the judge thinks that then he is right...
It is a very serious crime, and you might be able to attend a traffic offenders program to help reduce the sentance.. It was me that Christina was talking to about this stuff. As you are only on your P plates, the judge may want to make an example of you. Because you don't have much of a driving record you cant really use the "I am a good driver that has never had a fine" line of attack.
The police can take your car for this offence (so I am told) and they can also cancel your licence on the spot. But the cop has been nice enough to let you drive until your paperwork is processed. As for it being a $500 fine.. Not being rude, but you wish... Try more like $1550 as a fine + 6 points + automatic suspension for 6 months. This is the part where I repeat it is a serious offence...
Not sure what your appeal is going to be like. Most states have taken away the chance to appeal for some reasons. 1 of those reasons is suspension of licence due to loss of points (Yet again this is the case in NSW). If you are going to take it to court, then get a solicitor. It is always worth fighting because you could get a reduced sentance, or try and ask for a section 10 licence.. But given the fact you are a P plater, I don't thin the section 10 is an option. This is all information that you will be able to pay a solicitor to check into..
If you need further infrormation please feel free to PM me.