Kled is not a great botlaner, but with Ivern he can be a real problem without being take care of. Kled excells at assasinating squishy targets, and botlane is full of them. By level 3, you should be able to take out the enemy fairly easily, but stuns can be a real problem, which is why my 2 main bans in this lane are Zyra and Caitlyn. Cait can be a real issue, especially with her big range and traps, and Zyra's constant stunning can stop your pushes, so these 2 are on the banlist for me. Again, this is a duo strategy, so Ivern is the best support, due to his shield and his vine, allowing pushes to be a breeze. You can still play if Kled is banned, as Ivern was build as a support, but if Ivern gets banned, you're better off just dodging. Even though Blitzcrank or Thresh can work, without Ivern, Kled isnt a very good botlaner.

Starting the game, let the enemy take the first wave, and then take the fight to tower. Play it safe there till lvl 3.

As I said earlier, you should be looking for a push at level 3. Ivern should take 2 E's and one Q at the start of the game, and Kled should have all 3 abilities by now, and as soon as he hits lvl 3, the following moves should be done to secure a kill.

1. Ivern throws a Q at the ADC (or support, depending on the circumstances).
2. Kled uses that Q to dash to the target.
3. As Kled is dashing, Ivern should place an E on Kled, so he has some shield and some extra damage.
4. When Kled gets to his target, he should full combo them, and then put a Ignite on them, which should kill them. Then, Kled can deal some damage to the other lane opponent, hopefully getting them low.
5. As Kled is dashing in, Ivern should be advancing on the other one, dealing some damage along the way.
6. If done correctly, Kled should kill both of them, if not, at least one should die.

Thats the basic level 3 push. You should push again at level 6, like so:

1. Kled Ults the enemy from tower.
2. Ivern places Daisy when Kled hits his target.
3. Basically do the same stuff as level 3.
4. STONKS.

Thats really all there is to it. It's a bit of a struggle to level 3, but the moment you hit it, you really get going.