Ok sean so here is the low down with your situation - You're young, a beginner and dont have much cash.... Dont worry we've all been there...

I have basically narrowed your options down to 2. I will outline both below-
1. Your first option is to stick with your budget outlined earlier ($200-$400). Just so you are fully aware this is a
very
low budget but could still get you out on the water if you choose to still go down this path. There are some disadvantages however if you chose to stick to your original budget.
- Firstly the gear will be old and heavy which haircut outlined earlier. When learning this is not ideal as it makes the learning period more tiresome, which effectively reduces the time you spend learning on the water.
- Secondly the mast will most likely be a 1 piece mast which will make travelling to and from the beach/lake/river a little harder.
- But the biggest advantage of buying more modern equipment (newer than approx 10-12 years old) is that it is much easier to use and learn the fundamentals and basics. The learning period is usually shortened dramatically. Basically what I'm trying to say is that if your dedicated and
want
to learn the basic of windsurfing, it will happen
alot
faster for you on more modern gear than the older stuff
If you choose to go down this path, check out these ebay ads-
http://cgi.ebay.com.au/windsurfer-HiFly-Spirit-345-/180618981231?pt=AU_Sport_Surfing&hash=item2a0dbaef6fcgi.ebay.com.au/BEG-INTERMEDIATE-WINDSURFER-BOARD-PACKAGE-Melbourne-/130480895354?pt=AU_Sport_Surfing&hash=item1e6144757acgi.ebay.com.au/Windsurfer-Sailboard-Windsurfing-Board-Cheap-GOLDCOAST-/300519832055?pt=AU_Sport_Surfing&hash=item45f860b9f7 2. Now your second option is to try and get that budget up a little higher... If you could get it up to anywhere between $600-$1000 you would have a much better chance to buy equpiment that will be lighter, easier to use/learn and possibly have some "pieces" (mast/boom/extensions) that will last you alot longer than your original purchase.
Eg. If you can get your hands on an "ok" boom or mast, it may last you well into your 2nd or 3rd sail purchase if you get that far... The newer equipment you can get the more interchangable it can/will be with other reasonaly modern gear....
I would definately suggest going down the second option....
It is challenging but like someone else mentioned earlier, a local windsurfing shop should help... Also If you can get down to the sunshine coast I maybe able to assist with different bits and pieces as I have ALOT of older gear floating around which maybe useful....
Goodluck