What a beginner needs has always been a highly contentional topic here. My opinion for an average adult: the bigger the board, the better (160-200 litre beginner or freeride board), and a small sail (4.2-5.3 metre squared. Wave or freeride sail) for 5-10 knot winds. You'll learn quicker on a bigger board, and core skills like tacking (which many sailors don't learn) is easier to learn.
Before you spend money, see if you can borrow some gear to try out.
What is your weight and what area of SA do you live ?
I can long term loan you a sail if you live in Adelaide (it's a 4.7 wave sail).
I'm pretty sure others will pitch in with equipment, help and advice.
Good luck

, J