Udyr is my main right now and what i have to say is that he is such an interesting champion.he is a very fast jungler but also a very strong solo.He has lots of attack speed with his q and boosting his shield in early game can help you at tower-diving.

For reds i choose attack speed which is the most common for junglers, now for yellows i choose armor which gives you the choise not to buy the cloth armor in the beggining and buy boots or vampiric scepter,it also helps at your ganks.For blues i choose mr per level mostly for mid ganks. Finally for purples i choose flat attack damage.

I usually start with a cloth armor and 5 health pots.
On your first trip back (if you can afford it buy wriggle's lanntern)if you can't afford it buy madred's razors and boots.
On your second trip back buy wriggle's and go straight for a heart of gold.You should always rush at this item as it gives you a quite good amount of health and it also generates 5 gold every 10 seconds.
Then you core items should be ninja tabi(AD enemies) or mercury threads(AP enemies) or berseker's greaves (if you want to be agressive) and wriggle's and either a b.f. shword or a sheen(works really well with all his stances)
Your mid game items:
VS HEAVY AD
Randuin's Omen , Ninja Tabi , Phage(working on your tri-force) or a giant's belt working on your warmong's or your frozen mallet if your team hasn't got much chasing abilities.
Thornail would also be a great item.

VS HEAVY AP
Spirit Visage , Mercury Threads , Force Of Nature and Quicksilver Sash only if they have much cc(croud control ex.stuns slows etc.)

LATE GAME GOALS
Trinity Force , at least a b.f. sword , Omen and giant's belt

Well, your jungle route is quite usuall.Start at blue, then wolves,then you have two choises, you can either go for a lvl 2 gank on mid or top or you can continue jungling. If you continue jungling go to the ghosts' camp then trolls(waiting foryour smite to come up but if it has come up which i dont think can happen when you continue) and then go for your red.When you reach level 4 go for a gank on bot or mid. Now, if the enemy hasnt got a jungler you can go for their buffs and leve only one minion so that the buffs cant respawn if they DO have a jungler and his buffs are unguarded do the same, but you have to be very careful cause if it is warded they should come to gank you.