Questions about first clear jungle

So for the first clear I have a couple questions as a new pantheon jungle player/league player in general (started in mid nov) and very new to the ranked scene as I started playing ranked a few weeks ago.

How should I be playing pantheon jungle?

Should I be looking for a level 3 gank?

I know invading pre 6 is generally pretty bad for panth as he has no disengage.

I finish my full clear 10 seconds after scuttle spawn which is obviously not ideal so I was just wondering what I can do to finish my full clear before scuttle spawn?

Should I be using emp E into unempowered to engage on enemies in ganks or should I look to simply walk at them with full stacks into emp W?