Hi Shiffty and welcome to WAB
Patience is all that's needed. Once the weather starts to get colder and there is less natural food about they will start to visit your feeder. it takes a little time, but as Kayleigh said once they find your food source you'll have lots of birds visiting. It will be so interesting to see what kind of birds visit. The Greenfinches can be bullies, but sometimes birds can act out of character. I had a Coal tit see off a Great tit! I'm very fond of Coal tits and this one had the heart of a lion!
Tracey