For jungling xin you won't need a leash. I always start at wolves (they spawn before blue buff, and even with the dmg you take from the wolves you won't have any problem at blue buff, as long as you save your smite), then go to blue buff, wraiths, twin golems, then to red buff, then over the wraiths again, and back to wolves. At this point, you won't have to go back, but I would suggest it if there is a jungler on the other team. If there is not jungler then you can either try a gank if the opportunity is there, go to enemy jungle and pick up some more jungling there, or go b. It's really your choice and generally varies by situation.

Tip: Save your smite for blue buff golem and red buff golem, until you can take them down without much problems. Early game though it is important to smite those two.

Ganking with Xin is really easy to do. Your E is your best friend in ganks. Let the lane push a little, once they've pushed past the spot that you are in you can either flash towards them (I generally don't need to do, I'd rather save my flash to catch up to them in case they attempt to get away), or just start walking towards them with your E ready. Soon as you are in range of the target with your E, jump them and then hit your Q. This will deal dmg and knock them up after that 3rd hit, if played right you'll be able to snag that kill or assist without much problems. But remember if you are ganking a lane with 2 enemies in it, communicate with your teammate in that lane to pick which one you want to target first, otherwise, you'll walk away with nothing, or won't be able to walk away at all cause you'll have been slain.

Starting with Vampiric Sceptor allows you to stay in jungle longer before you have to go "b". You will later build this into Wriggles. This will allow you to either ward your drag, or a buff or help out a laner with a free ward. It's really situational on how you use your ward. I then grab boots of speed and start building a Tiamat, this allows you to jungle much faster and also when you go to gank if there are 2 of the enemy team in lane you'll be able to do dmg to both cutting down time that it takes to kill the enemy. After Tiamat, finsh your boots. I generally go with Beserkers but if there are a lot of slows and stuns, you might want to take Mercs. After finishing up boots, I like to build a Madreds Bloodrazor this will give you more attack speed and whether they have tanks or not you're still going against their life (but let's be honest, what noob team doesn't have a tank or two?) ;). After that I will build a Phantom Dancer or Black Cleaver depending on how the other team is building, but either way I still get them both, it's just a matter of what order. When I've built everything there I will sell my wriggles and and get a Blood Thirster, cause who doesn't want more dmg and lifesteal? As always items can be situational, but I will say I just played with this build and carried like a boss. (20/10/23) *they started focusing me =/ but my dmg and passive and lifesteal kept me goin. I was able to take 2-3 of them at a time. But no matter how you build, just have fun and don't get to frustrated.