Patrick,
I am presuming you are on the east coast. A kite between 10m-11m would be a good size to start out as your main kite. Should get you going from around 15-16knots with a top range of 24 knots, (top range will increase as you get better). I am around 70kg, and the bottom end won't change too much on the 12m, but you will struggle to hold on in stronger winds.
The Cabrinha Nomad, is a kite that needs to be used in a slightly stronger wind, or use a size up. The Nomad, is Cabrinha's answer for a more dedicated wave kite. If you never go out in waves, then there may be a better kite for you. I ride the switchblade, and find it great in the flat water, and waves. It depends on the type of kiting you think you want to get into, some are suited for some disciplines more than others.
It is confusing as each company puts out a few different styles, and the are heaps of brands too choose from. Everyone is probably going to say demo a few different kites, and see what suits you, though I think when you are learning, this is a harder feat to achieve, as most people are struggling just to hold the kite comfortably in the air. I would recommend talking to the shops, and don't just ask the questions on what they have 2nd hand, ask questions based on the types of places you will be kiting, your size, etc.
Good luck
KR
