Begin with a circle. Write your idea (problem, issue, goal) in the circle.
Now write every related thought or idea around the circle, like moons orbiting a planet.
By laying out your ideas like this, you can often see common elements or links between concepts that you wouldn't see if you had written down your ideas in a linear, list-like way.
The mind map is a good place to begin. Your ideas are all in front of you. As with any map, you first need to know where you are.