That will house my business and my redence. What is the best way to Insulate?
Most heat is lost through the ceiling and roof. Begin there with insulation in the attic. Caulk around all windows and doors - outside and inside. If you can afford to replace the windows with double paned windows, that would help a lot. Those things would be the first things to do.
The suggestions above are great. You can add plastic to the crawl space as a barrier as well.
How to Know What Insulation is Behind Your Walls
If you live in an older home, understanding what pads your walls is essential to keeping your family safe.
Start with this link: