Hi,
Where abouts are you located?, Al from Planet surf in the North is a great start and Damian Wallace in the south. These guys usually have or know where to find some gear.
Alternately Windsurfing Tasmania has learner boards available to lend, these boards will be available again in early Feb. Contact me 0400638795 for more detail.
As for what board I believe you will benifit greatly from aquiring a semi modern board for your re entry to windsurfing. Whilst older boards are cheap the newer designs make windsurfing so much easier and exhilerating.
I would reccomend a board of at least 150L, possibly a bit more. The Funster and x-cite rides as well as the rio's are all boards that will be forgiving in the initial stages as well as exhilerating as you progress allowing you to keep the board for some time before downsizing...
Feb 9th and 10th is the Northern Learn to windsurf days at Low Head, there will be plenty of boards to try out with instruction available... be great to see you there!
Welcome back!