^^i think he's after a trainer kite bud
Hey mate, trainer sizing smaller doesn't really matter as it is about learning the wind window, flying skills etc. I'd go one of the ones that has the proper bar and lines, depower etc, 2-4m. Ozone probably with the best one, but store guys will know better.
Getting a 6 is fine if you are thinking that it will be useful as a high wind kite later on, but looping it, hard fly it in gusts etc at 20kn+ and it could still get you hurt on land

My tip is a 2m trainer with proper bar and lines etc of you're set on it, but probably more effective will be those first lessons with a good instructor and then a few dozen hours body dragging on a full size kite out in the water. Good luck
Oh and the tips above on full size kites are good stuff from weebit