Are you completely new to League of Legends?
If so, then this guide should help you out a bit.
It's a guide meant for complete beginners, so therefore very simplistic in it's approach. I won't overload you with masses of information!
Quick Points:
Top gets more XP than a Duo Lane
Jungler earns more gold than he would in a double lane
More team Gold by controlling Dragon
Ganking will turn a lane into the favour of a team for duration of the gank, 2v1 , 3v2 etc..
The enemy will constantly not know where 1 of your teammates is (the jungler)
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