I definitively want to buy a fly rod and start fly fishing

I would like to spend about 100$ on it, there's a 69$ Orvis one that
seems to me too cheap, but I can't really judge.
I saw Cabelas and Bass Pro Shop offers, and Cabelas has nice prices, but
I don't know anything about fly rods, so: what are the right
characteristics of a fly rod? (material, lenght, range, line supported,
pieces ecc..)
I think should be on graphite, right?
the 4 pieces rods are very comfortable to transport (even for a trip),
but structurally and functionally are ok? too many junctions aren't bad?
the rod will be weak or rigid?
the weight should be balanced? the action fast, medium or what?
and so on..

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ciao
Vittorix