i have just started fly fishing and not sure on rod and reel sizes?

Question by brett: i have just started fly fishing and not sure on rod and reel sizes?
i have bought a fly fishing kit with size 5/6 rod and reel for small river fishing but im looking at other rods i was looking at size 7/8 rods and reels but cant see any difference between the rods and was wondering why i cant just put a size 7/8 line and reel and use my 5/6 rod ive looked but cant find any thing that tells me why i cant
please help

Best answer:

Answer by Brian
For a small stream i would be using a 3/4 rod and match it up with the same size reel and line and i would use it for trout but i dont know what kind of fish you will be fishing for.

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