How can I bake normal maps from a high poly mesh to a low poly mesh in Blender Cycles?

Personally I don't recommend using Cycles for normal map baking. Here's a lesson on doing it with Blender Render, which is faster: https://cgcookiearchive.com/blender/lessons/5-normal-map-baking/ Use the same process for Cycles, just change the engine from "Blender Render" to "Cycles".