You know the old saying, I went to look for a job but they say I need experience but how do I get experience if I can't get a job?
That's the way it is with brushes. You don't know what you like until you have tried it but how can you try without buying? I would say get something in badger middle of the road and not too expensive and then you can go forwards or back depending on your experience.
Just about any brush will make lather. it's about the ergonomics and the feel on your face really.