Thinking about energy cost

Starting to plan out a few steps that need to be done for reducing my costs of energy. The first think I think that makes the most sense is to have 2×6 walls on the outside walls so that I have can have R-19 insulation. Also looking to put R-50 in the ceiling. With the insulation I am looking to seal all the can lights with the covers that look like small styrofoam coolers. More blog postings to come with the energy cost savings.