Stone walls begin below the ground, not on top of the ground. If you want a flat area choose flat stones 8. Always lay one stone over two or more stones 9. Each stone must rest solidly on the stones beneath it 10. Maintain level courses 11.
Stones move slowly.
Working with stone takes time. Even a small project is not done quickly. Never be afraid to ask for help. Every great project has been the result of people working together. Despite its solidity, stone moves and settles over the years.