I didn't know where to start
The first step was to clean up the smell. We, brought in a company called "Clean Air Connection". They cleaned out the vents, put a room deodorizer in the vents and came back the next day to scrub carpets. I wanted the carpets gone but that is not in the budget yet.
The we hired a contractor, Rod Hoffman from "Hoffman Homes". The kitchen was torn apart. I would say the kitchen would be a good place to start.
If you look at the before picture, it shows the counter space as small and divided. One part lower then the rest. My idea, was to have the space used by one big counter. Usable from both sides. Also below the counter is 'space', this space is for storage of all those appliances that do not need to take up counter space.
a long way to go but it was a start.