Appropriate foods will likely be described in the better books on birds or by your local feed store. We will also mention some here. Corn is a good crowd pleaser. You can get large sacks of low grade corn for placing on the ground, or on the point of a nail stuck in a tree or the end of a stick poked in the ground when using corn that is still on the cob. Seed of various types is an obvious answer though you will want to be sure you have your native creature s favorites foremost.
Sunflower seeds are a popular item.
Check with the department stores in your area in their outdoor sections. A local farm supply if you have one is also an ideal place to find proper feed and a handy expert who will enjoy teaching you the proper menus. Make a careful list of the types of birds you want to attract and then narrow it according to which types you can afford to attract as well. Know your current environment in order to know where it needs changing. There is also such a thing as keeping out that which will keep the birds away.