hi and welcome to YT. congrats on your new little girl. As your female gets a little older your 1 year old male might start marking the house. he might start claiming things as his, especially if he doesn't take to her for a while. If you do a search on YT you'll find TONS of great reasons for spaying and neutering your pets.
as for food, there are tons of great puppy foods out there. you can check out
www.dogfoodanalysis.com for some suggestions or do a search here. the higher the star the better the food. Some here say 6 stars is too much protein but i do not agree since i fed a raw diet.
good luck with your puppies.