I use single point focus, and single point metering. I try to get the selected focal point on the eye or very close to it.
If the bird has white areas, especially direct sun, use some negative exposure compensation to avoid blowing out the highlights.
You need a high shutter speed to freeze motion, especially in small birds. 1/1000 second or faster is good and 1/500 is the minimum for small birds, in my somewhat limited experience. Small birds make very fast tiny movements of their heads that will give motion blur at anything much slower. You will need adequate light so that your maximum lens aperture & ISO can give you that shutter speed.
With larger birds you can have slightly slower shutter speeds and many people use center-weighted or matrix metering.
Cruise on over to the wildlife forum, and see what people there are using to take the sort of pictures you like. Ask lots of questions. They are very helpful.
Sometimes you need to manipulate the settings. Most people don't like to have a feeder showing. So you can arrange some attractive perch near the feeder but not so close as to be in every image. Again, look for tips in the wildlife forum.
working on it in Middle TN Nikon D3100
35 mm 1.8 Nikkor 18-55 mm Nikkor VR 55-200 mm Nikkor VR 55-300 mm Nikkor VR 150-500 mm Sigma OS Feisol CT3471 & Markins M20 ballhead