Hi and welcome to YT
! I used to live in Minneapolis, btw.
Bless your heart for taking in this little one...I bet he's precious.
Don't worry too much about the quality of food right now, just get him eating...even if it's not the best food.
One trick to try right away is to sprinkle some Parmesan Cheese (from the can) on his food, it can be really enticing for dogs.