A good idea would be to look over our daily menu threads. Be aware that sometimes they're not completely Core, but you can get some good ideas there. Also, check out our recipe board for some great recipes.
As far as breakfast, you can have hot cereal like Cream of Wheat, oatmeal, etc. Or cold cereals like shredded wheat or puffed wheat. Eggs are also Core, so you can do a lot with them too. I also like having fruit & yogurt for breakfast too.
Good luck, and feel free to join us on our weekly chat board.