This is the first build I post :) It's exactly how I play with Kayle.
This build is mostly effective if you are MID Solo.
Hope you enjoy, any good comments are welcome.

Ignite: Use it whenever you can on enemy heros. (Gives you +10 Ability power)
Ghost: Usefull for chasing/escaping.
Reckoning: Use it whenever you can on enemy heros. It's your harass skill/slow.
Righteous Fury: Your farming ability. Use it on grouped creeps for tons of gold. With 40% Cooldown Reduction you can always be ranged (like 0.5 sec delay)
Divine Blessing: Good heal if you have enough mana. Otherwise I would keep it for the movement speed bonus, which is a + when chasing or backing. You should be one of the fastest heroes.
Intervention: With this build, you should be the carry, so you might want to use your ultimate on yourself most of the times. If it's not the case, you can also save teamates if you see they are running low and you are full hp.

GUIDE TO FIRST BLOOD: You must play aggresive.
As soon as the first wave comes out Ignite+Reckoning on the other hero. (His HP Should be at 2/3 or less) Keep harassing with Reckoning whenever you can. Don't try to hit the enemy with melee attacks, this will result in a failure, be patient. Once you get level 2, Reckoning+RighteousFury on the enemy hero. You should be able to get the first blood (3 games out of 5). You might also be badlucky (in a way) if the enemy survive and goes back to heal. But in any case either you have the kill or more experience than him. (If he does so, just get a lot of last hits on creeps for more gold with Righteous Fury) Try not backing until you have 1100 gold for Sorcerer's shoes and preferably 1520 so you can get a dagger too.

Whenever you can, kill the neutral creeps for the Cooldown Reduction buff. It's a must, get the buff whenever you can. Same thing for the Damage buff. If you have to choose between both, get blue first.

Have fun and show them that Kayle can be the top carry :)
See you in game,
Elvow,