Hi there, i love your reasons for wanting to lose weight, they are all good and will help keep you motivated. After a while, I expect you will find that they change in order of priority though, and that will be pretty funny.
Well done on ditching the sugar and resisiting your dh's treats. If you have been well nourished during the day, those supper snacks will barely tempt you.
As for having him join you, great idea if he wants to so I hope he does. Otherwise, just do your best to shop and cook primally and he will be halfway there at least. What man would turn down an extra serving of meat for dinner, or bacon and eggs for breakfast?