Welcome to my first guide here on mobafire :D
First off all I want to say that English is not my original language so if there is any mistake tell me :)
This guide will help warwicks's new players, and a little about jungling.

I take normal runes for junglers..
Greater Mark of Attack Speed i took this cause will allow me to clear faster the jungle you can take 9 marks of Greater Mark of Desolation and Greater Quintessence of Attack Speed if you want.
Greater Seal of Armor indispensable for any jungler.
Greater Glyph of Scaling Magic Resist also you can take Greater Glyph of Magic Resist I prefer per level for late game.

My masteries are a little rare but I raelly like them cause cover all what I need..
You can take 4 points on Swiftness But i like more vision on WARDS that are gonna be helpful

For items I start with Long Sword and a Health Potion I start with blue asking a teammatte to lash it.
Then buy Boots and get Wriggles's Lantern, I take this first for free wards and in late game I sell it for Madred's Bloodrazor
The other items are tanky. Remember you are a Tanky-DPS
Depending on the other team you can take MR or ARMOR

Take a point on Hunters Call and then max Hungering Strike take a point at lvl 4 your E for gankRemember to turn it off when you are wainting for gank PLS Get always a point on your Infinite Duress when you have it. IT'S YOUR BEST SKILL if you use it right it's a kill for your team.

best Summoner Spell (for me) and

Always if you are gonna jungle.
You can take to replace Flash

How I said before ask a parthner to leash blue, wolf camps, then ghost (yeah i know is not the right name but i don't remember :B ) then 2 golems and if you have life get red and if you not recall and buy.
After red take a look at the map and see if someone need help or a gank, go to the lane always with a ward, put it, and then gank
Try to get lvl 6 fast for better ganks.

You are the tanky dps so you must be the initiator unless you have a tank, Tell to your team who would you throw your ulty so they can focus

Well I hope this guide helped you and fell free to comment see ya :)