Every time I write something about bird feeding, I wonder why most people who love horticulture-y things, also love to feed birds. I might know a handful of plant people who don't, but all-in-all, we plant people are bird people too.
That said, be sure to provide birds in our area lots of black oil sunflower seed. Just by putting this out, you will get a nice mixture of many species of birds.
Suet will attract those insect-eating birds like woodpeckers, wrens, chickadees, titmice, and nuthatches. Hang it up in some sort of mesh wire or cloth & be sure to put it up where dogs can't get to it.
And another important item to provide birds is WATER. You will be rewarded.