Oh sorry, my bad. I was looking purely at the VCE application on pgs 93 onwards. Alrighty, I've had a good look at the DECV enrollment steps and this, from my understanding is the process you need to undertake to get an DEECD number.
1. Depending on what category you're applying for, you need to gather your supportive documentation (whether this be a principal's referral, a medical report or something else) as well as the parent/caregiver's form and either the 1. School referral, 2. practitioner form or 3. agency form (you fill them out here:
http://www.distance.vic.edu.au/enrol/enrforms.htm#A) to the Distance Education Regional Approval Officer via mail or fax it to DECV with your region's number. Information about regions' addresses are situated in the link above under 'instructions'
2. After that the regional person will notify you of the outcome of your application by phone or by mail. They will supply you with an application number to place on your form.
3. Complete the enrollment form to send it.
Sounds like a horribly exhaustive process, I am so sorry it isn't easier =/. It was easy for me as I am a school-based student. This sounds rather irritating because I know you want to get a head start, but start with the samples for week 1 on the website here:
http://www.distance.vic.edu.au/subschools/ss1112.htm#subjects (you're probably aware of this, but I thought i'd provide the link just in case.) Also, I undertook psych and received a 50 so if you want any online help or anything you're more than welcome to message me and I can teach you concepts over skype or something! I know it's a new study design, but I am quite familiar with it because I have taught myself it and am preparing myself for uni psych etc. So I'll try my best!
Hope this helps!