As Nooksack Mac pointed out, first find out what weight your rod needs to flex properly. Department stores will sell good starter lines for short $ although you might buy better lines as you get better yourself. SA makes good starter lines (Concept, Headstart) with good quality materials.
As far as casting, I would suggest talking to any experienced anglers you know - someone at a flyshop, an uncle or friend, etc.
Definitely practice before you go to get the basics of casting down. You don't want to be trying to learn while trying to catch fish at the same time.
If you think it would help for us to tutor you in casting, just say so.
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