How to jungle in a Summoner's Rift?

So I've been wanting to play jungle role for a while, and play champions like Lee Sin{{champion:64}} , Master Yi{{champion:11}} , Kayn{{champion:141}} , and Diana{{champion:131}} . Each time I try, it doesn't go too well... which items should I buy, what route should I take, and how can I successfully 1v1 the other jungler if I bump into them? I've been buying life steal and attack damage items like the Bloodthirster{{item:3072}} and the Ravenous Hydra{{item:3074}} but they probably aren't the best items to use._.
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