I am a mother of five children. I have always been a big girl since about the age ten. When I reached the age of 15 I managed to only be 25 lbs overweight. Once I got further along in high school, working in my grandparents deli, I gained over 75 Lbs. After having my first baby, I went from 175 to 235.  

Throughout my other pregnancies the weight kept increasing. I am now at 345 lbs and just so disgusted in myself. I have developed arthritis because my joints can't handle my weight, I get winded walking up one flight of stairs, I also have depression and anxiety (low levels right now), but I am a full time mom, full time student, and I never exercise. I eat all of the wrong foods, sometimes feeling like I just can't stop eating. There have been times that I have gorged myself.

So considering I am at home all of the time, what exercises can I do to get a good start at an exercise program, and what kind of foods should I be eating?  I took a nutrition course in my Associates degree but learned nothing obviously.  
I just want to be healthy, take the weight off my joints, and be able to lose weight so I can get up and down the stairs without being winded, learn how to eat, and just overall, be in a better place in my life.