i dont know what to do. i have all puzzels but 6 10-12. got the 25 people but cant get the other hut to appier to start building. i cant do 12 cause i dont have anyone with anyskill in building. so how do i get the hut started?? no GC eather

The villagers will initiate construction of the new hut on their own, but you need to have a villager who already has some building skill, and whose preferred skill is set to construction, before that will happen. If you don't have any builders, and you're playing v1.0, you will have to hope that more debris washes up on the beach so that you can train a builder. If you're playing v1.1, you can train new builders by having them fix the huts that they've already built.

The last 3 puzzles require Level 3 in specific Village Technologies.

how do i amek them fix a hut i have seen them just do it but that was a long time ago

Just drop a villager on one of the huts they built.

i have finished all the puzzles and have all the tech areas fully researched, the golden child has opened the cave...what happens now? how does the game end? is there more, or do they all end up dying? is this it?

I assume that you dragged an adult villager into the cave after it was opened. If not, you should at least do that.

There is a discussion about what to do after you've solved the puzzles here. You might find it interesting.