Hi all,
Highly recommend getting an AIS transponder (ie transmitter/receiver) rather than just a receiver. Get your MROCP certificate (it's not hard really and strictly speaking, you should have this qualification if you use a VHF radio), then you can get an MMSI from AMSA, stick that number in your AIS, enable transmit mode, and walla! - all those big ships can see you.
You can use your AIS transponder in receive mode (so you can see all those big ships and anyone else who is transmitting AIS) until you get your MMSI.
Easy way to get your MROCP and your MMSI:
1) get the "MARINE VHF RADIO OPERATORS HANDBOOK" - from say boatbooks.com.au and read through it.
2) go to
https://www.amc.edu.au/revision-questions-mrocp - this is the website of the Australian Maritime College (AMC) in Tasmania.
The above link takes you to a free online MROCP revision question utility where you can practice answering MROCP exam questions until you feel confident.
3) Using the
Invigilator Search on the AMC website, find an 'invigilator' (an authorised MROCP examiner) near you, and organise to sit for your MROCP for a nominal fee. He will give you a multiple choice exam paper which you do ( takes maybe an hour), he sends this to AMC who advise by letter whether you pass or fail.
4) Assuming you pass, you get a MROCP certificate (a plastic card same size as a credit card). Now get an MMSI application form from the AMSA site, fill it out quoting your certificate number and you will be issued an MMSI number.
5) Program your AIS with your MMSI number, enable AIS transmissions, and now anyone with AIS can see you

regards,
Allan