Can you recommend a good current guide for Warwick?

Is this really a question? ww is quite easy to play. Just buy the recommended items and get a few kills and you'll be unstoppable. unless you're in a really high elo or theres a direct counter.

Just gank early a ton, use your e fear when you get behind them, and rush Tiamat first back

At a glance, This seems like a good intro. :^)

That aside. League of Graphs is generally a decent place to start if you want to see what is/isn't working for people recently.