cabelas beginner flies

I am new to ff, will be ordering a Cabelas 5 piece pack rod/reel combo
tomorrow. Is there anything you would recommend in flies for a beginner
that I can also get from Cabelas (without spending $50, hopefully)? I
will be fishing primarily small streams and brookie creeks roughly
10-30 feet wide, in northern WI and MN . I havent yet decided whether
to go with a 3 or 4 wgt, although I'm leaning towards the 4 because it
comes in a shorter length (7'6") and I think that will work better on
the small creeks (and be easier to learn with?). Any thougts on that
choice will also be appreciated though.