Hi there.
For
, you should generally start with 

when you're jungling.
General Build: 
then tank items.
You should start with your E first to get the attack speed at level 1, then take Q at level 2 to get the knock up. Most Xin Zhao players like to max W first starting from level 3, and max E second starting from level 10.
Xin Zhao's passive heals him for a little bit of health every third auto-attack. So you have to continue auto-attacking with Xin Zhao even as you drag the camp so that he remains healthy while clearing. Don't just attack the monster then run away to stand in a set spot. Auto-attack, walk a couple of steps, auto-attack, walk a couple of steps, repeat. Doing this properly should allow you to easily save time on your clear, save your smite for important camps, and remain quite healthy.
A camp resets based on how fast its "Patience" bar depletes. A camp's leash range (distance that the monsters walk to attack you) is around 700 units (a small bit larger than your E range), and outside of that leash range, the patience bar depletes rapidly(in about one second). Damaging the monster delays its patience bar depletion. It is possible for some champions with very high attack speed or dps in the mid and late game (such as Kindred or Ezreal) to constantly delay the patience bar depletion and drag a camp quite a bit farther than normal. Both Kindred and Ezreal and other such champions can sometimes drag the wolf or raptor camps to the mid lane with enough attack speed or proper spell weaving. Xin Zhao generally can't do that though since his base attack speed is meh and he doesn't build all attack speed items anymore.
For
, you should also generally start with 

when you're jungling.
General build: 

then tank items.
You should start with your W for the AoE and bonus auto-attack damage at level 1, then take E at level 2 because it does more damage than your Q. Most Shyvana players like to max W first, and max E second from level 10.
Shyvana doesn't really have passive healing on her kit, so you'll have to rely on your potions, scuttle crab, and the jungle plants to remain healthy. Shyvana can use the same method that Xin Zhao uses to kite camps.
On Shyvana specifically, dragons are very important due to her passive. Prioritize getting dragons if you can.