While jungling use your E to kill the whole camp. Getting W as your second ability you will survive in jungle with full hp

Use W then Q to slow down your enemies and then start to damage them with E

Kayle is really good at counter jungling at lvl 1. If your team invades their blue/red buff they are going to be close to each other so you can damage them all with your E

With the rune of vampirism and alacrity you wil survive the jungle easily

Flash is optional you can take Ghost too but Smite is a must