I'm about to buy my first kite and board and just would like to have some advices or thoughts about it.
I'm 75kg, 178cm with over 15 years of experience in surfing and recently windsurfing just for fun. I've had a lesson learning the basics and I've done some body dragging n the water and some heel dragging on the sand too... I believe I need another 2 or 3 lessons, maybe more but I 'd like to start using the my own gear during the classes if possible, so I can build up some confidence with the equipment that I'm going to use and eventually go out by myself and start having fun.
The kite I'm about to buy is a Naish Cult 12m which will be used on the Gold Coast. I've been told that a 12 m would work just fine for my weight and because I'm a beginner too. The board size is 136 and I could also use one of my old surfboards.
Is this appropriate? How hard will be the transition from just a first class to my first attempts on this kite and board?

What year Cult is it, all the cults are beginner friendly but imo the safety was better on the 2010 models. At your weight 75 a 12m & 136 sounds about right to me. After your lessons it,s up to you, you just have to get out there and do it. Looking at your background your board skills should be good(might feel a bit uncomfortable going switch).
So concentrate on flying the kite first and once you feel ready grab the board and have a crack.

Rebels are great kites as well, while learning a second hand 2010 model (if you can find one) would do you as there half the price of a new one and you wouldn't know the difference while learning.

Good luck fella,s and keep it safe.

many kite shops would kive u lessons for free if u buy the equip with them!!!