Supportive but in the dark wife needing advice

We found out a little while ago my husband is type 2. We are you a typical gamers. Eating to much junk food and carbs. Also both of grew up pretty poor. So not really exposed to fruits and veggie. More like dollar meanu and carbs.

My point is I'm really in the dark on what to cook, what to buy and how to help him. My husband is frustrated feeling hungry and the limit of stuff. I want to make sure he has all the tools he needs to be successful. I want to better understand the diet needs. We have made huge shifts in our diets. More fruits hardly any carbs. I'm struggling on what to cook for dinner. Most of all the sides. I'm a box mash potatos or Mac and cheese girl. Again not good in the veggies department.

So any advice in general so I can better understand how to help him be successful