Hi there,
This is my second season fly fishing and I can tell you that things do get better.
Forums like this and just talking to your fellow anglers on the bank will improve your catch rate no end.
Its hard to say what line, lenght of leader or fly you should use as I don't know where you are fishing. Ask the owner or warden. Also speak to anyone else fishing to see if what they are doing is working.
I think its fair to say that buzzer fishing is not the easiest art to master. Both presentation and bite detection are key to fishing buzzers and this is something that you will only gain with time.
Have you tried fishing with a blob? Last week I fished a small still water and those around me were catching on buzzers. Naturally I took the same appraoch but with no luck. I switched over to an orange blob and hey presto took a couple of nice rainbows.
Good luck!