Welcome to the dark side!...
For light wind you cant go past a big foil. The benchmark for years has been flysurder 15m speed 3 deluxe. I use this kite 6-20 knots on the landboard. 6-10 cruising, 10-15 jumps, 15-20 silly big jumps..... (well big for land anyway).
Once you start jumping on the land you realise a lot smaller jump gives you a bigger thrill. 10 foot above hard sand and you must land it nice or you will hurt!...
Now there is a new competition to speed 3. that is the ozone chrono.... looks very interesting.
You can use open cell foils too. But if your on the water a big close cell foil will also work as a light wind kitesurfing machine also.
In the higher winds just use your lei's. Start riding a size down from what you use on the water. Then when you can handle the jandle same size.
As for boards. Big wheels/heavy boards are better for high speed, rough terrain and soft sand. Little skate truck boards with small wheels are good for tricks but are twitchy at speed and getr stuck in soft sand.
I run a monster board for ultimate speed, boost and soft sand a nd light wind riding ability.
Bellow is one of my vids from a view years back