I'm Terranrenderer, and I've just started playing Ekko, considering I really don't like mid lane, I decided to play him old school. In the Jungle! Before I started playing Ekko, my winrate was below 40%, after I found Ekko, it went up to 55%. Ekko is a great burst damage champ...Late game. Early game you can still do lots of damage by procing your passive, but you can't solo fight most other junglers. Your ganks are what will get you ahead, because you need that experience and gold.
I'm not done with this guide yet, I'm trying to get an against champs page.

Ekko is squishy. Sorry, that's the facts of the matter. Tank Ekko isn't really viable like it was in season 6. For increased sustain have the support, or toplaner tank it a bit.
There are 4 main clears you can take.
1: Full Blue Clear
-Start Blue Buff, get gromp, then wolves, then Raptors and finally Red Buff. Use your smite on the blue at the beginning, and the red at the end. If you can manage an invade, do so, if not, check scuttle. Then recall. Remember to ward where the enemy champs might be coming when you invade. Don't try without at least 3/4 health. Even if the camp is not there, if you've warded, that can be just as important.
A warning, DON"T AFK FARM! Doing this farming route gets you a good amount of experience, but your team might get a little mad if you don't gank in time.

2: Quick Scuttle and Gank
-Start the bottom side of the jungle. Get a multiple unit camp (for example: I started Red Buff, because it was bottom, then got wolves because I knew Lee Sin had started Red, and was probably headed bottom, then got Topside Scuttle.), then get Scuttle. Knowing where your enemy is is essential. Pay attention to who leashes them. Last you Gank, because now you're full health and almost three. If you get enough experience from minions, you can level up during the gank, time this, you can get kills because of it.

3: Quick Invade
-Start the buff the enemy jungler would. If they start red, you start yours. Instantly move across the river. Take your dash second, so you can dash through the dragon/baron pit. You can avoid wards in the two river bush clumps. Don't be greedy, and ward very carefully. If you can avoid using smite on the first buff, and still be healthy, do it. A smite for invading is essential. Past that, just farm as needed in your own jungle.

4: Gank Oriented Jungle Route
-Take red, then raptors, then gank, then scuttle then repeat gank. pretty self-explanatory, and dangerous.

I take Chilling Smite because I'm more of a teamplayer